Seaward ClareHAL - Manual (Page 127)

126
The absolute maximum ratings for the internal opto-isolators are
associated with the top socket are:
Maximum Forward Voltage - 55 Vdc
Maximum Reverse Voltage - 7 Vdc
Current per Switch – 50 mA
Total Power – 100 mW
On resistance typically is 140 Ohms, off being open circuit
Operation beyond these values will damage the opto-isolators.
Connections and recommended values for components are shown
below:
To PLC
PASS
FAIL
HAL
1kOhm 1kOhm +12Vdc
-V
The Pass and Fail outputs follow the behaviour of the Indictors on the
front of the tester, and are shown below. PLEASE NOTE THAT THE
DIAGRAMS SHOW THE TYPICAL ON RESISTANCE FOR THE
OPTOCOUPLER DEVICES WITHIN THE HAL.
Your HAL tester