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Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

KVC758A124 3BHE021951R1024 IGCT high voltage module

records. If an exact replacement model is required, the MAIN PROGRAM VERSION, MOD NUMBER(S), ORDER CODE, and SERIAL NUNBER should be specified with the order. • SERIAL NUMBER: This is the serial number of the PQMII. This should match the number on the label located on the back of the PQMII. • DATE OF MANUFACTURE: This is the date the PQMII was final tested at GE Multilin. • DATE OF CALIBRATION: This is the date the PQMII was last calibrated.

The GE Multilin PQMII implements a subset of the AEG Modicon Modbus RTU serial communication standard. Many popular programmable controllers support this protocol directly with a suitable interface card allowing direct connection of the PQMII. Although the Modbus protocol is hardware independent, the PQMII interface uses 2-wire RS485 and 9- pin RS232 interfaces. Modbus is a single-master multiple-slave protocol suitable for a multi-drop configuration provided by RS485 hardware. In this configuration, up to 32 slaves can be daisy-chained together on a single communication channel. The PQMII is always a Modbus slave; it cannot be programmed as a Modbus master. Computers or PLCs are commonly programmed as masters. The Modbus protocol exists in two versions: Remote Terminal Unit (RTU, binary) and ASCII. Only the RTU version is supported by the PQMII. Monitoring, programming and control functions are possible using read and write register commands.

Electrical Interface 

The electrical interface is 2-wire RS485 and 9-pin RS232. In a 2-wire RS485 link, data flow is bi-directional and half duplex. That is, data is never transmitted and received at the same time. RS485 lines should be connected in a daisy-chain configuration (avoid star connections) with a terminating network installed at each end of the link, i.e. at the master end and the slave farthest from the master. The terminating network should consist of a 120 Ω resistor in series with a 1 nF ceramic capacitor when used with Belden 9841 RS485 wire. The value of the terminating resistors should be equal to the characteristic impedance of the line. This is approximately 120 Ω for standard #22 AWG twisted-pair wire. Shielded wire should always be used to minimize noise. Polarity is important in RS485 communications: each '+' terminal of every device must be connected together for the system to operate. See 2.2.11 RS485 Serial Ports for details on serial port wiring.