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
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