SYNRAD® 32-1 Operator’s Manual Version 2.2
48
User I/O Connections
Technical Reference
Sample DB-9 Connector I/O circuits
Sample input circuits
The gure below illustrates a method of connecting a relay contact or limit switch to act as a
remote keyswitch. Remember that Remote Keyswitch and Remote Interlock inputs are “dry
circuit” or zero-voltage inputs.
(7) REMOTE KEYSWITCH
OUTPUT
(6) REMOTE KEYSWITCH
INPUT
DB-9 CONNECTOR PINS
RELAY CONTACT OR
LIMIT SWITCH
Figure 4-8 Remote Keyswitch circuit.