GE IC698CPE020-JX Embedded Communication Module

GE IC698CPE020-JX Embedded Communication Module

GE IC698CPE020-JX mainly consists of one Siemens ECO1-7500/3 inverter, one S7-200 PLC (CPU215/216, with EM235 expansion module), as well as contactors, operating buttons, one on-site pressure transmitter and two vibration measuring devices (vibration transmitters), with PLC to realize the compressor outlet pressure single loop PID control and various electrical control functions such as start-stop, switching, fault handling, etc. to achieve predictive maintenance and repair. The PLC is used to realize single-loop PID control of the compressor outlet pressure, as well as various electrical control functions such as compressor starting, stopping, switching, and troubleshooting, etc. The vibration transmitter monitors and analyzes the status of the compressor in order to realize predictive maintenance and repair. The main circuit is shown in Figure 2.

CPU215/216 in GE IC698CPE020-JX has special functions such as 32-bit floating-point arithmetic instructions and built-in PID regulation arithmetic instructions. When using, just fill in the PLC memory 1 PID control parameter table (see table below), and then the implementation of the instruction: PID TABLE, LOOP, you can complete the PID operation. Which operand TABLE use variable memory VBx, used to specify the starting address of the control loop; operand LOOP is the control loop number (constant, 0 to 7). Parameters numbered 2, 4, 5, 6, 7 are fixed and can be set in the main program of the PLC; parameters numbered 1, 3, 8, 9 are real-time, and must be filled in when calling the PID instruction.

GE IC698CPE020-JX inputs and outputs are switching quantities, while the signals from the inverter, pressure transmitter and vibration transmitter are analog quantities, so the EM235 module should realize D/A conversion. One EM235 module can be simultaneously extended with 3 analog input channels (connected to 1 pressure signal and 2 vibration signals) and 1 analog output channel (connected to the frequency converter).