February 2012 24 – 399
24.6 Checking the outputs
The MB 620 features 8 PLC outputs which serve, for example, to control the lamps of the buttons.
These outputs are on the terminal strip X7.
The function of the PLC outputs can be checked with the HSCI bus diagnosis:
8 Switch on the machine.
8 Call the HSCI bus diagnosis. --> See ”Bus diagnosis” on page 12 – 147.
8 Open the path MB 620 / Digital Output and place the cursor on the output to be inspected.
8 Establish the conditions for setting the output concerned (keystroke, function call, etc.).
Ask the machine operator.
8 The output must change condition.
You can now find out, e.g., whether a lamp is defective or is not controlled correctly.
X7: Connecting terminals Assignment
1 O0 (illumination for the NC Start key)
a
a. With standard wiring
2 O1 (illumination for the NC Stop key)
a
3 O2 (illumination for the Control voltage ON key)
a
4O3
5O4
6O5
7O6
8O7
9+24 V NC
10 0 V
Be sure to ascertain which function of the output to be inspected has on the machine.
You can measure the voltage of the outputs at terminal X7 of the MB 620.
The logical state in the HSCI bus diagnosis must be in agreement with the voltage level of the
respective outputs.
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