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Installation Instruction ASB 150 02 > Boards for ASB 150 02

## CPU‑D2 (ROF 157 5118/2) CPU‑D3 (ROF 157 5118/3) AUX2 (ROF 1575 119/2) AUX3 (ROF 1575 119/3)

Before installing the board mount the system software PROMs in the appropriate positions (A, B and C).

#### Connections on the CPU-D2(3)/AUX2(3)

##### Temperature sensor

For connection of the Temperature sensor kit, see chapter Temperature Sensor

##### Alarm input/output

The ALARM input is optically isolated and the voltage has to be between 20 - 60 VDC.

The ALARM output is equipped with an open collector transistor with a load capacity of 20 mA at 12 VDC (Maximum 14 VDC).

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