Owner`s manual

Digital Output Relay Module
8-4
A dual selector dipswitch (S3) on the DO Relay module has 4 selectable positions as described
in the following table:
Table 8-1 DO Relay Module- Dipswitch Settings
S3
SW 1
S3
SW 2
Configuration mode
O (OFF) N (OFF)
12V_DO – Relay inhibiting enabled
1 (ON) N (OFF)
Software selectable – inhibiting is set in site configuration
O (OFF) 2 (ON)
12_DO– Relay inhibiting enabled
1 (ON) 2 (ON)
12 V – (factory default) Relay inhibiting disabled
ON
12
Figure 8-3 12V DO Dipswitch
When S3 is set to Software Selectable mode, the inhibiting configuration is set using the
module configuration in the STS Site Configuration (see Table 8-2 below).
Procedure 8-1 describes how to set the 12V DO dipswitch to enable relay inhibiting.
Procedure 8-1 How to Set the 12V DO Dipswitch to Enable Relay Inhibiting.
1) If the 2-pin TB is plugged into the 12V DO Control on the front panel of the power supply
module, unplug it.
2) Remove the DO module from the slot in the rack.
3) Carefully remove the plastic wrap covering from the S3 dipswitch (see Figure 8-3) on the
DO module board.
4) Set the S3 dipswitch to the desired position, according to the legend in Table 8-1.
5) Replace the DO module in the rack.
6) If the new dipswitch position causes DO relay power to be drawn from the 12VDO, plug
the 2-pin TB back into the 12V DO Control on the front panel of the power supply module.
DO Keep Last Value (KLV) and Predefined Value (PDV)
Each output can be configured to KLV or to a PDV (0, 1). This value is executed when the
user program stops or when the module has no communication with the CPU module. Also, the
PDV can be used during normal operation to force a value on the output by ignoring the user
program value (mask).