To see certain digital output functions, you must include the corresponding equipment in the single-line diagram.
Relay state
The relay state (whether it is open or closed) depends on the relay hardware, the coil state and the function (or alarm) state. The
following table shows how these combine to give the relay state.
Table 13.1
Relay state
Hardware Coil configuration Function (or alarm) Relay state
Normally open Normally de-energised Not activated Open
Normally open Normally de-energised Activated Closed
Normally open Normally energised Not activated Closed
Normally open Normally energised Activated Open
Normally closed Normally de-energised Not activated Closed
Normally closed Normally de-energised Activated Open
Normally closed Normally energised Not activated Open
Normally closed Normally energised Activated Closed
The effect of the relay hardware, the coil state and the function (or alarm) state is also shown below under Coil state.
CAUTION
Incorrect connection of the relay, or incorrect configuration of the relay function, will cause incorrect operation.
Relay hardware
The relay hardware can be normally open or normally closed. The relay hardware returns to its normal state when the controller has
no power. The relay hardware type is shown on the hardware module faceplate.
Normally open relay hardware:
• All PSM3.1 relays
• IOM3.1 terminals 1,2
• IOM3.1 terminals 4,5
• IOM3.1 terminals 7,8
• IOM3.1 terminals 10,11
• All EIM3.1 relays
• All GAM3.1 relays
• All GAM3.2 relays
Normally closed relay hardware:
• IOM3.1 terminals 3,2
• IOM3.1 terminals 6,5
• IOM3.1 terminals 9,8
• IOM3.1 terminals 12,11
Coil state
You can configure the normal coil state in the display unit or PICUS. Under Configure > Input/output, select the terminals, then
select Normally de-energised (the default) or Normally energised for the Coil state.
DESIGNER'S HANDBOOK 4189340911K UK Page 415 of 521
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