Power supply security device with record uploading function

Abstract

The utility model belongs to the technical field of security devices, and particularly relates to a power supply security device with an uploading and recording function. The utility model provides a power supply security device with a record uploading function. The device comprises a single-chip microcomputer part, an analog-to-digital conversion part, a Flash storage part, a power supply circuit part, a liquid crystal screen interface part, an SD storage part, an Ethernet communication part, a USB communication part, a relay control part, a 485 communication part and an SDRAM expansion part. The device is characterized in that a signal transmission port of the single-chip microcomputer part is respectively connected with a signal transmission port of the Flash storage part, a signal transmission port of the liquid crystal screen interface part, a signal transmission port of the SD storage part, a signal transmission port of the Ethernet communication part, a signal transmission port of the USB communication part and a signal transmission port of the 485 communication part; and a signal transmission port of the SDRAM expansion part is connected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the security device technical field especially, it is a kind of power supply security device with upload record function. BACKGROUND

[0002] Distribution box security device is a kind of device that can monitor the input voltage, current, frequency, phase of electrical equipment in real time, when power supply or electrical equipment fails, power supply can be quickly cut off, so as to protect the safety of electrical equipment.Simultaneously, security device saves the fault phenomenon, fault time information etc.into its internal storage chip, personnel can operate and its matching liquid crystal screen, call out fault record, then analyze the reason of fault occurrence.

[0003] The existing security device can only save fault record in security device interior, and must be viewed historical fault information by the liquid crystal screen of accompanying, and there is certain inconvenience in use. UTILITY MODEL CONTENT

[0004] The utility model is just in view of above problem, provide a kind of power supply security device with upload record function.

[0005] To realize above-mentioned purpose, the utility model adopts following technical scheme, the utility model includes single-chip microcomputer part, analog-digital conversion part, Flash storage part, power supply circuit part, liquid crystal screen interface part, SD storage part, ethernet communication part, USB communication part, relay control part, 485 communication part and SDRAM extension part, its characterized in that the signal transmission port of single-chip microcomputer part is connected with the signal transmission port of Flash storage part, the signal transmission port of liquid crystal screen interface part, the signal transmission port of SD storage part, the signal transmission port of ethernet communication part, the signal transmission port of USB communication part, the signal transmission port of 485 communication part, the signal transmission port of SDRAM extension part, the signal transmission port of relay control part, the signal transmission port of analog-digital conversion part, respectively, the power supply port of single-chip microcomputer part is connected with the power supply port of Flash storage part, the power supply port of liquid crystal screen interface part, the power supply port of SD storage part, the power supply port of ethernet communication part, the power supply port of USB communication part, the power supply port of 485 communication part, the power supply port of SDRAM extension part, the power supply port of analog-digital conversion part, the power supply port of relay control part, respectively.

[0006] As a preferred scheme, the single-chip microcomputer part adopts the GD32F470ZET6 chip U1, the 1~5, 7, 10~15, 18~22, 25~29, 34~37, 40~50, 53~60, 63~70 feet of U1 are respectively connected with PE2~PE6, PC13, PF0~PF10, RESET, PC0~PC3, PA0~PA7, PC4, PC5, PB0~PB2, PF11~PF15, PG0, PG1, PE7~PE15, PB10, PB11, the 73~82, 85~93, 96~105, 109~119, 122~129, 132~142 feet of U1 are respectively connected with PB12~PB15, PD8~PD15, PG2~PG8, PC6~PC9, PA8~PA15, PC10~PC12, PD0~PD7, PG9~PG15, PB3~PB7, BOOT0, PB8, PB9, PE0, PE1.

[0007] As another preferred scheme, the Flash storage part adopts the W29N01 chip U4, the 9, 8, 18, 7, 16, 17, 29~32, 41~44 feet of U4 are respectively connected with PD7, PD4~PD6, PD11, PD12, PD14, PD15, PD0, PD1, PE7~PE10.

[0008] As another preferred scheme, the power supply circuit part adopts the TMI3411 module U3, the 4 feet of U3 are connected with 5V, the 5 feet of U3 are respectively connected with one end of resistance R1 and one end of resistance R5, the other end of R1 is connected with GND, the other end of R5 is respectively connected with 3V3 and one end of inductance L1, the other end of L1 is connected with the 3 feet of U3, the 1 feet of U3 is connected with 5V.

[0009] As another preferred scheme, the liquid crystal screen interface part adopts the FPC1 flat cable interface, the 3, 8~12, 15~20, 24~40 feet of FPC1 flat cable interface are respectively connected with PD13, PB0, PA11, PA12, PA8, PG6, PA6, PG10, PB10, PB11, PC7, PD3, PG11, PG12, PA3, PB8, PB9, PG7, PC6, PA4, PF10, PE4, PE2, PE5, PE6, PD12, PD11, PB6, PB7.

[0010] As another preferred scheme, the SD storage part adopts the TFCard J4, the 3, 5, 7, 8, 1, 2, 9 feet of J4 are respectively connected with PD2, PC12, PC8~PC11, PC6.

[0011] As another preferred scheme, the Ethernet communication part adopts LAN8720A chip U6, and the 12, 13, 16-18, 8, 7, 11, 14 pins of U6 are respectively connected with PA2, PC1, PB11, PB12, PB13, PC3, PC4, PA7, PA1 in correspondence; the 21, 20, 23, 22, 3, 2 pins of U6 are respectively connected with TXP, TXN, RXP, RXN, LED_LNK, LED_SPD in correspondence; and the 6, 3, 2, 1, 9, 12 pins of HR911105A module J6 are respectively connected with RXN, RXP, TXN, TXP, LED_LNK, LED_SPD in correspondence.

[0012] As another preferred scheme, the USB communication part comprises TYPEC-12P interface J1 and USB-A interface J2, the D+ port of J1 is connected with PA12, and the D- port of J1 is connected with PA11; the D- port of J2 is connected with PB14, and the D+ port of J2 is connected with PB15.

[0013] As another preferred scheme, the analog-digital conversion part adopts AD7606 chip U7, and the 9-14, 16-22, 24, 25, 27-32, 33 pins of U7 are respectively connected with PC8, PC9, PC10, PD4, PC2, PC3, PD14, PD15, PD0, PD1, PE7, PE8, PE9, PE10, PE11, PE12, PE13, PE14, PE15, PD8, PD9, PD10 in correspondence, and the 49, 51, 53, 55, 57, 59 pins of U7 are respectively connected with AVIN1-AVIN6 in correspondence.

[0014] As another preferred scheme, the relay control part adopts the emitter of S9012 triode Q1 to be connected with 5V, the base of Q1 is connected with PB0 through resistor R26, the collector of Q1 is connected with the 4 pin of HF32FV relay K1, the 1 pin of K1 is connected with the ground, and the 2, 3 pins of K1 are respectively connected with the 1, 2 pins of connector J7 in correspondence.

[0015] Secondly, the 485 communication part adopts MAX485E chip U5, the 1 pin of U5 is connected with PA10, the 2, 3 pins of U5 are connected with PA8, the 4 pin of U5 is connected with PA9, and the 6, 7 pins of U5 are respectively connected with 485A, 485B in correspondence.

[0016] In addition, the SDRAM expansion part adopts W9825G6KH-6I chip U2, the 2, 4, 5, 7, 8, 10, 11, 13, 15-26 feet of U2 are connected with PD14, PD15, PD0, PD1, PE7-PE10, PE0, PC0, PG15, PF11, PC2, PG4, PG5, PG0, PF0, PF1, PF2, PF3 respectively, and the 29-39, 42, 44, 45, 47, 48, 50, 51, 53 feet of U2 are connected with PF4, PF5, PF12-PF15, PG1, PG2, PC3, PG8, PE1, PE11-PE15, PD8-PD10 respectively.

[0017] The utility model has the advantages of the following.

[0018] The utility model security device works, by analog-digital conversion chip converts external voltage value, current value analog quantity into digital quantity.

[0019] The utility model single-chip microcomputer part as the core element of security device, its work includes: with analog-digital chip communication reads the actual value of voltage and current;Internal program compares actual value with set value in real time, and responds to cut off the circuit after exceeding threshold value;Actual value is sent to liquid crystal screen and receives personnel operation liquid crystal screen set parameter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further described below in combination with the drawings and specific embodiment.

[0021] Figure 1 It is the utility model single-chip microcomputer part circuit principle diagram.

[0022] Figure 2 It is the utility model Flash storage part circuit principle diagram.

[0023] Figure 3 It is the utility model power supply circuit part circuit principle diagram.

[0024] Figure 4 is the relay control part circuit principle diagram of the utility model.

[0025] Figure 5 is the SD storage part circuit principle diagram of the utility model.

[0026] Figure 6 is the Ethernet communication part circuit principle diagram of the utility model.

[0027] Figure 7 is the USB communication part circuit principle diagram of the utility model.

[0028] Figure 8 is the 485 communication part circuit principle diagram of the utility model.

[0029] Figure 9 is the analog-digital conversion part circuit principle diagram of the utility model.

[0030] Figure 10 is the liquid crystal screen interface part circuit principle diagram of the utility model.

[0031] Figure 11 is the SDRAM extension part circuit principle diagram of the utility model.

[0032] Figure 12 is the structure schematic view of the utility model.

[0033] The figure number corresponds respectively: 1. single-chip microcomputer;2. analog-digital conversion part;3. 485 communication chip;4. NAND storage chip;5. SDRAM chip;6. power interface;7. 485 communication interface;8. USB Slave interface;9. USB Host interface;10. RJ45 network interface;11. TF card seat;12. liquid crystal screen interface;13. relay control part. DETAILED DESCRIPTION

[0034] As shown in the figure, the utility model discloses a single-chip microcomputer part 1, flash memory part 4, power supply circuit part, analog-digital conversion part 2, liquid crystal screen interface part 12, SD memory part, relay control part 13, ethernet communication part, USB communication part, 485 communication part 3 and SDRAM extension part 5, the signal transmission port of single-chip microcomputer part is connected with the signal transmission port of flash memory part, the signal transmission port of liquid crystal screen interface part, the signal transmission port of SD memory part, the signal transmission port of ethernet communication part, the signal transmission port of USB communication part, the signal transmission port of 485 communication part, the signal transmission port of SDRAM extension part, the signal transmission port of relay control part, the signal transmission port of analog-digital conversion part respectively, and the power supply port of power supply circuit part is connected with the power supply port of single-chip microcomputer part, the power supply port of flash memory part, the power supply port of liquid crystal screen interface part, the power supply port of SD memory part, the power supply port of ethernet communication part, the power supply port of USB communication part, the power supply port of 485 communication part, the power supply port of SDRAM extension part, the power supply port of analog-digital conversion part, the power supply port of relay control part respectively.

[0035] The single-chip microcomputer part adopts GD32F470ZET6 chip U1, and the 1~5, 7, 10~15, 18~22, 25~29, 34~37, 40~50, 53~60, 63~70 pins of U1 are connected with PE2~PE6, PC13, PF0~PF10, RESET, PC0~PC3, PA0~PA7, PC4, PC5, PB0~PB2, PF11~PF15, PG0, PG1, PE7~PE15, PB10, PB11 respectively, and the 73~82, 85~93, 96~105, 109~119, 122~129, 132~142 pins of U1 are connected with PB12~PB15, PD8~PD15, PG2~PG8, PC6~PC9, PA8~PA15, PC10~PC12, PD0~PD7, PG9~PG15, PB3~PB7, BOOT0, PB8, PB9, PE0, PE1 respectively.

[0036] The core architecture of GD32F470ZET6 chip is Cortex-M4, the working frequency is 240mHz, 3MB of FLASH storage space and 768KB of SRAM running memory are built-in, which can store and run complex programs. At the same time, it has full-speed / high-speed USB OTG, Ethernet, SDIO, EXMC, liquid crystal screen TLI and other advanced interfaces, which is convenient for communication with other chips or other external devices. RTOS (real-time operating system) can be used for task management, so that each task is executed in order according to the set priority, avoiding mutual interference of each task affecting the stable work of the whole system.

[0037] The Flash storage part uses W29N01 chip U4, and the 9, 8, 18, 7, 16, 17, 29-32, 41-44 pins of U4 are respectively connected with PD7, PD4-PD6, PD11, PD12, PD14, PD15, PD0, PD1, PE7-PE10.

[0038] The NAND storage chip uses W29N01GVSIAA with a storage capacity of 512MB. When the single-chip microcomputer needs to save historical fault information, the data can be saved in the chip for a long time, so as to prevent data loss after power failure.

[0039] The power supply circuit part uses TMI3411 module U3, the 4 pin of U3 is connected with 5V (5V is the power interface 6 in Figure 12 , and the power interface 6 is connected with 5V power adapter externally), the 5 pin of U3 is respectively connected with one end of resistor R1 and one end of resistor R5, the other end of R1 is connected with GND, the other end of R5 is respectively connected with 3V3 and one end of inductor L1, the other end of L1 is connected with the 3 pin of U3, and the 1 pin of U3 is connected with 5V.

[0040] The liquid crystal screen interface part uses FPC1 flat cable interface, and the 3, 8-12, 15-20, 24-40 pins of FPC1 flat cable interface are respectively connected with PD13, PB0, PA11, PA12, PA8, PG6, PA6, PG10, PB10, PB11, PC7, PD3, PG11, PG12, PA3, PB8, PB9, PG7, PC6, PA4, PF10, PE4, PE2, PE5, PE6, PD12, PD11, PB6, PB7.

[0041] FPC1 flat cable interface connects the liquid crystal screen. Personnel can set the parameters of AC overvoltage value, under-voltage value, over-current value and frequency overrun value by operating the liquid crystal screen.

[0042] The SD storage part uses TFCard J4, and the 3, 5, 7, 8, 1, 2, 9 pins of J4 are respectively connected with PD2, PC12, PC8-PC11, PC6.

[0043] J4 is Figure 12 The TF card seat 11.

[0044] The Ethernet communication part adopts LAN8720A chip U6, and the 12, 13, 16-18, 8, 7, 11, 14 pins of U6 are connected with PA2, PC1, PB11, PB12, PB13, PC3, PC4, PA7, PA1 respectively; the 21, 20, 23, 22, 3, 2 pins of U6 are connected with TXP, TXN, RXP, RXN, LED_LNK, LED_SPD respectively; and the 6, 3, 2, 1, 9, 12 pins of HR911105A module J6 are connected with RXN, RXP, TXN, TXP, LED_LNK, LED_SPD respectively.

[0045] J6 is Figure 12 The RJ45 network port 10. The RJ45 network port is used for inserting a network cable, and when the upper computer and the security device of the utility model are not in the same place, the security device can be remotely accessed through a local area network or the Internet, and the internal data of the security device can be viewed and backed up in the upper computer or mobile phone.

[0046] The USB communication part comprises a TYPEC-12P interface J1 and a USB-A interface J2, the D+ port of J1 is connected with PA12, and the D- port of J1 is connected with PA11; the D- port of J2 is connected with PB14, and the D+ port of J2 is connected with PB15.

[0047] J2 (that is Figure 12 The USB Host interface 9 can be inserted into a U disk, and the TF card seat 11 can be inserted into a TF card, and the two interfaces are used for transferring data to a mobile storage device for backup, so that the internal historical fault record of the security device can be read out after the security device fails.

[0048] J1 (that is Figure 12 The USB Slave interface 8 can be connected with the USB interface of the upper computer through a USB data line, the single-chip microcomputer takes the security device as a USB HID type device, and the internal data of the security device can be viewed and backed up in the upper computer in cooperation with the upper computer.

[0049] The 485 communication part adopts MAX485E chip U5, the 1 pin of U5 is connected with PA10, the 2 and 3 pins of U5 are connected with PA8, the 4 pin of U5 is connected with PA9, and the 6 and 7 pins of U5 are connected with 485A and 485B respectively.

[0050] 485A and 485B are connected with the 485 communication interface J5, and J5 is Figure 12 The 485 communication interface 7.

[0051] The SDRAM extension part adopts W9825G6KH-6I chip U2, and the 2, 4, 5, 7, 8, 10, 11, 13, 15-26 pins of U2 are respectively connected with PD14, PD15, PD0, PD1, PE7-PE10, PE0, PC0, PG15, PF11, PC2, PG4, PG5, PG0, PF0, PF1, PF2, PF3 in pairs, and the 29-39, 42, 44, 45, 47, 48, 50, 51, 53 pins of U2 are respectively connected with PF4, PF5, PF12-PF15, PG1, PG2, PC3, PG8, PE1, PE11-PE15, PD8-PD10 in pairs.

[0052] The W9825G6KH chip has 32MB running memory. When the single-chip microcomputer needs a larger running space or needs a display memory function, the built-in SRAM of the single-chip microcomputer may not meet the demand, and the external expansion memory is needed to complete the normal work.

[0053] The analog-digital conversion part 2 adopts AD7606 chip U7, and the 9-14, 16-22, 24, 25, 27-32, 33 pins of U7 are respectively connected with PC8, PC9, PC10, PD4, PC2, PC3, PD14, PD15, PD0, PD1, PE7, PE8, PE9, PE10, PE11, PE12, PE13, PE14, PE15, PD8, PD9, PD10 in pairs, and the 49, 51, 53, 55, 57, 59 pins of U7 are respectively connected with AVIN1-AVIN6 in pairs.

[0054] J3 is connected with an external sampling circuit, and the sampling circuit can be a voltage transformer and a current transformer.

[0055] The sampling precision of AD7606 chip U7 is 16 bits, the sampling speed reaches 200ksps, contains 8 channels, and can meet the conversion of three-phase voltage, three-phase current and leakage current analog quantity at the same time. The EXMC communication interface can be used for communication between the single-chip microcomputer and the analog-digital conversion part 2, 16-bit data can be read out at a time, and the sampling speed is high. After the single-chip microcomputer reads the digital quantity converted by the analog quantity, the FFT algorithm is used in the single-chip microcomputer to process the original data, and the amplitude, frequency and phase of the sinusoidal wave can be obtained, so as to prepare for comparison with the set value.

[0056] The single-chip microcomputer part, the Flash storage part, the power supply circuit part, the liquid crystal screen interface part, the SD storage part, the Ethernet communication part, the USB communication part, the 485 communication part, the analog-digital conversion part 2 and the SDRAM extension part are arranged on the circuit board, and the circuit board is arranged in the shell.

[0057] The relay control part 13 adopts the emitter of S9012 triode Q1 to connect with 5V, the base of Q1 is connected with PB0 through resistor R26, the collector of Q1 is connected with the 4th pin of HF32FV relay K1, the 1st pin of K1 is connected with the ground, the 2nd and 3rd pins of K1 are respectively connected with the 1st and 2nd pins of the connector J7.

[0058] J7 can be connected with external contactor contacts, when the relay K1 coil is energized and attracted, the K1 normally open contact is closed, the external contactor contacts are attracted, and the purpose of energizing the electrical equipment is achieved.

[0059] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical scheme described in the utility model embodiment, and the person skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect, as long as the use needs are met, it is within the protection scope of the utility model.

Claims

1. A power security device with upload record function, comprising a single-chip microcomputer part, an analog-to-digital conversion part, a Flash storage part, a power circuit part, a liquid crystal screen interface part, an SD storage part, an Ethernet communication part, a USB communication part, a relay control part, a 485 communication part and an SDRAM extension part, characterized in that The signal transmission port of the single-chip microcomputer part is connected with the signal transmission port of the Flash storage part, the signal transmission port of the liquid crystal screen interface part, the signal transmission port of the SD storage part, the signal transmission port of the Ethernet communication part, the signal transmission port of the USB communication part, the signal transmission port of the 485 communication part, the signal transmission port of the SDRAM extension part, the signal transmission port of the relay control part and the signal transmission port of the analog-digital conversion part respectively, and the power output port of the power supply circuit part is connected with the power supply port of the single-chip microcomputer part, the power supply port of the Flash storage part, the power supply port of the liquid crystal screen interface part, the power supply port of the SD storage part, the power supply port of the Ethernet communication part, the power supply port of the USB communication part, the power supply port of the 485 communication part, the power supply port of the SDRAM extension part, the power supply port of the analog-digital conversion part and the power supply port of the relay control part respectively.

2. The power security device with upload record function according to claim 1, characterized in that The single-chip microcomputer part adopts a GD32F470ZET6 chip U1, the 1-5, 7, 10-15, 18-22, 25-29, 34-37, 40-50, 53-60, 63-70 pins of U1 are connected with PE2-PE6, PC13, PF0-PF10, RESET, PC0-PC3, PA0-PA7, PC4, PC5, PB0-PB2, PF11-PF15, PG0, PG1, PE7-PE15, PB10, PB11 respectively, the 73-82, 85-93, 96-105, 109-119, 122-129, 132-142 pins of U1 are connected with PB12-PB15, PD8-PD15, PG2-PG8, PC6-PC9, PA8-PA15, PC10-PC12, PD0-PD7, PG9-PG15, PB3-PB7, BOOT0, PB8, PB9, PE0, PE1 respectively.

3. The power security device with upload recording function according to claim 1, characterized in that The Flash storage part adopts a W29N01 chip U4, the 9, 8, 18, 7, 16, 17, 29-32, 41-44 pins of U4 are connected with PD7, PD4-PD6, PD11, PD12, PD14, PD15, PD0, PD1, PE7-PE10 respectively.

4. The power security device with upload recording function according to claim 1, characterized in that The power supply circuit part adopts a TMI3411 module U3, the 4 pin of U3 is connected with 5V, the 5 pin of U3 is connected with one end of resistor R1 and one end of resistor R5 respectively, the other end of R1 is connected with GND, the other end of R5 is connected with 3V3 and one end of inductor L1 respectively, the other end of L1 is connected with the 3 pin of U3, the 1 pin of U3 is connected with 5V.

5. The power security device with upload recording function according to claim 1, characterized in that The liquid crystal screen interface part adopts FPC1 flat cable interface, and the 3, 8-12, 15-20, 24-40 pins of the FPC1 flat cable interface are respectively connected with the PD13, PB0, PA11, PA12, PA8, PG6, PA6, PG10, PB10, PB11, PC7, PD3, PG11, PG12, PA3, PB8, PB9, PG7, PC6, PA4, PF10, PE4, PE2, PE5, PE6, PD12, PD11, PB6 and PB7.

6. The power security device with upload recording function according to claim 1, characterized in that The Ethernet communication part adopts LAN8720A chip U6, and the 12, 13, 16-18, 8, 7, 11 and 14 pins of the U6 are respectively connected with the PA2, PC1, PB11, PB12, PB13, PC3, PC4 and PA7; the 21, 20, 23, 22, 3 and 2 pins of the U6 are respectively connected with the TXP, TXN, RXP, RXN, LED_LNK and LED_SPD; and the 6, 3, 2, 1, 9 and 12 pins of the HR911105A module J6 are respectively connected with the RXN, RXP, TXN, TXP, LED_LNK and LED_SPD.

7. The power security device with upload recording function according to claim 1, characterized in that The USB communication part includes a TYPEC-12P interface J1 and a USB-A interface J2, the D+ port of the J1 is connected with the PA12, the D- port of the J1 is connected with the PA11, the D- port of the J2 is connected with the PB14, and the D+ port of the J2 is connected with the PB15.

8. The power security device with upload recording function according to claim 1, characterized in that The analog-digital conversion part adopts AD7606 chip U7, and the 9-14, 16-22, 24, 25, 27-32 and 33 pins of the U7 are respectively connected with the PC8, PC9, PC10, PD4, PC2, PC3, PD14, PD15, PD0, PD1, PE7, PE8, PE9, PE10, PE11, PE12, PE13, PE14, PE15, PD8, PD9 and PD10; the 49, 51, 53, 55, 57 and 59 pins of the U7 are respectively connected with the AVIN1-AVIN6.

9. The power security device with upload recording function according to claim 1, characterized in that The relay control part adopts the emitter of the S9012 triode Q1 to be connected with 5V, the base of the Q1 is connected with the PB0 through the resistor R26, the collector of the Q1 is connected with the 4 pin of the HF32FV relay K1, the 1 pin of the K1 is connected with the ground, and the 2 and 3 pins of the K1 are respectively connected with the 1 and 2 pins of the connector J7.

10. The power security device with upload recording function according to claim 1, characterized in that The SDRAM extension part adopts W9825G6KH-6I chip U2, the 2, 4, 5, 7, 8, 10, 11, 13, 15-26 feet of U2 are connected with PD14, PD15, PD0, PD1, PE7-PE10, PE0, PC0, PG15, PF11, PC2, PG4, PG5, PG0, PF0, PF1, PF2, PF3 respectively, the 29-39, 42, 44, 45, 47, 48, 50, 51, 53 feet of U2 are connected with PF4, PF5, PF12-PF15, PG1, PG2, PC3, PG8, PE1, PE11-PE15, PD8-PD10 respectively.

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