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Service Manual CS3000
Chapter 2: Input/Output board IKK-4
2-3
The circuit board of the control unit
Document no.:
S-4-007.875/E
Prepared:
1995-03-17 Fia
Revision:
R4 2004-03-15 BM
© 1995, Consilium Marine AB
1. Data buffer
The data bus is buffered before entering/leaving the board.
2. Address decoder
The address decoder selects the different blocks. The address decoder is
controlled by the control unit board.
3. Regulator
The regulator converts power voltage to 5 VDC.
4. Expansion
Future expansion possibilities. Not used.
5. Board ID
The control unit board reads the IKK-4 ID.
6. Inputs
Reads all external inputs.
7. Outputs
Controls the four transistor outputs.
8. Buzzer
An external buzzer may be connected via a transient protected output. The
buzzer will be parallel connected to the fire alarm and the fault buzzer on the
control unit board.
9. Barrier
The RS 232 communication is protected against transients before entering the
control unit board.
10. System loop barrier
Transient barrier for the system loop.
11. Barrier
The power supply voltage output is protected against external transients.
12. Power supply output
A fused and fault supervised output for power supply to an external device.
13. Opto-isolated inputs
Four opto-isolated transient protected external inputs.
14. Opto-isolated outputs
Four transistor outputs. Deactivated at hang-ups in the programme execution.