Terminal Symbol Name Type
24 Bi-directional input
Digital input (OFF: 0 to 2 V DC, ON: 8 to 36 V DC, Impedance: 4.7 kΩ)
25 Bi-directional input
26 Bi-directional input
27 Bi-directional input
28 Bi-directional input
29 Bi-directional input
30 Bi-directional input
31 Bi-directional input
32 COM Common Common for digital input terminals 24 to 31
13.8.3 Transistor output characteristics and configuration
Symbol
Hardware modules
IOM3.4
The controller can use transistor outputs for many purposes. Examples: Activate alarm devices, open and close breakers, and
genset speed and voltage regulation.
Configuration
All transistor outputs are configurable. You can assign a digital output function, or configure one alarm, for a transistor output.
You can program customised transistor output functions using CustomLogic.
You can also create customised digital output functions using CustomLogic, and assign a transistor output.
Controller types and single-line diagram
The controller type determines which digital output functions are available.
To see certain digital output functions, you must include the corresponding equipment in the single-line diagram.
Transistor state
The transistor hardware itself is normally open. The transistor output state (whether it is open or closed) depends on the
configuration in software and the function (or alarm) state. The following table shows how these combine to give the transistor state.
Table 13.26
Transistor state
Configuration in software Function (or alarm) Transistor state
Normally de-energised Not activated Open
Normally de-energised Activated Closed
Normally energised Not activated Closed
Normally energised Activated Open
The effect of the configured state and the function (or alarm) state is also shown below.
CAUTION
Incorrect connection of the transistor, or incorrect configuration of the transistor function, will cause incorrect operation.
DESIGNER'S HANDBOOK 4189340911K UK Page 442 of 521
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