Multi-path temperature control heating current detection system

Abstract

The invention provides a multi-path temperature control heating current detection system. The system comprises a PLC system with a PLC analog quantity input module and a PLC digital quantity output module, mainly, temperature control heating areas are distributed, each eight-area heating main loop passes through a current transmitter, linear relation conversion is carried out through the PLC system, and an actually measured current value is obtained; in the case of heating in a heating area, a heating signal with the duration of 400 ms is outputted, in the period, heating signal output of other seven loops connected to the same current transmitter needs to be forcibly closed, synchronous execution of an instruction for reading the numerical value of the analog quantity input channel wherethe corresponding current transmitter is located is carried out once, the instruction is saved in a register, the current value of a single loop is displayed on a human-computer interface through conversion, and so on, each loop is sampled in sequence, and data are refreshed according to a set sampling period. According to the technical scheme, line arrangement and later maintenance can be facilitated, the accuracy of multi-path temperature acquisition is ensured, and the input cost and the production cost are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of temperature control, in particular to a novel single-channel acquisition and multi-channel temperature control heating current detection system. Background technique [0002] At present, the number of temperature-controlled heating zones in food packaging machinery is relatively large, and some even reach more than 80 zones. Under normal circumstances, each heating control circuit needs to be equipped with a current transformer to detect the real-time current of each zone. This method Increased the cost of current transformers, it is necessary to connect an ammeter in series with one circuit, or install a current transformer in one circuit, and the number of cables is large, which is not conducive to line layout and later troubleshooting, and the rated power required by the DC power supply is relatively high. High, the cost is higher. Contents of the invention [0003] The purpose of the present invent...

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Problems solved by technology

[0002] At present, the number of temperature-controlled heating zones in food packaging machinery is relatively large, and some even reach more than 80 zones. Under normal circumstances, each heating control circuit needs to be equipped with a current transformer to detect the real-time current of each zone. This method Increased the cost of current transformers, it is necessary to connect an ammeter in series with one circuit, or install a current transformer in one circuit, and the number of cables is large, which is not conducive to line layout and later troubleshooting, and the rated power required by the DC power supply is relatively high. high, high cost

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