February 2012 18 – 273
If the 24 V-PLC supply voltage at X3 / terminal 4 is already missing during startup, the PLB 62xx is
not found in the HSCI bus system.
The message Hardware/firmware change detected is displayed. --> See ”Message Hardware/
firmware change detected” on page 18 – 245.
If the 24 V NC voltage at X3 / terminal 1 drops during machine operation, the following error
messages may be issued:
8 Try to delete all error messages with the CE key. --> The permanent errors will remain in the ERR list.
If the 24 V-NC supply voltage at X3 / terminal 1 is already missing during startup, the PLB 62xx is not
found in the HSCI bus system.
The message Hardware/firmware change detected is displayed. --> See ”Message Hardware/
firmware change detected” on page 18 – 245.
Troubleshooting
8 Observe the LEDs on the PLB 62xx system module.
If the power supply is correct, the green 24V NC and 24V PLC LEDs shine.
8 Measure the 24 V voltagse at X3.
8 In the window Hardware/firmware change detected, click Reject and then call the HSCI bus
diagnosis. --> See ”Bus diagnosis” on page 12 – 147.
8 Disconnect the touch probe systems and the safety-related PLC outputs from the PLB.
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