INFICON SQC-222 Thin Film Deposition Controller - Manual (Page 81)

Appendix
PLC Connections
If you are using the optional PLC for I/O, you must first connect the PLC to the RS-232
connector on the SQC-222. The single RS-232 connector of the SQC-222 supports two
serial connections – one for the PLC, the other for computer communications. Sigma
cable PN 505-053 is a “Y” cable for connecting both. The pinout is shown below.
Signal SQC-222 PLC Computer
Tx Data 1 2 2
Rx Data 1 3 3
Tx Data 2 7 2
Rx Data 2 1 3
Ground 5 9 5
Connector DB-9P DB-9P DB-9S
C AUTION : Both the SQC-222 and the Omron PLC use a special RS-232 pinout. Do not
use a standard serial cable. Damage to the SQC-222 or the PLC could result.
Mount the PLC controller near the devices it is controlling and sensing. Connect the
PLC to a properly grounded power source. See the PLC User Manual on the Sigma
CD-ROM for detailed PLC mounting and connection information. Connect the serial
cable from the PLC serial port to the SQC-222 serial port.
Input Wiring: PLC Inputs are mapped to events in the SQC-222 System Setup, PLC
Inputs menu. SQC-222 Inputs 1 to 12 correspond to Omron Inputs 0.0 to 0.11.
Omron PLC input wiring is shown below.