July 2010 23 – 397
23.5 Checking the Outputs
The MB 420 and the MB 520 features 8 PLC outputs which serve, for example, to control the
lamps of the buttons.
These outputs are located on the connecting line of the MB control and also on the following
terminal blocks:
With the table for the PLC outputs you can check the condition of the outputs:
8 Call the table with the PLC outputs. --> See “The TABLE function” on page 11 – 119.
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.
Figure: Observation of the lamp for the button "Control On" in the PLC table
MB 420 MB 520 Pin layout
Terminal X4 Terminal X12
11O0
22O1
33O2
44O3
55O4
66O5
77O6
88O7
990 V
-10+ 24 V
Be sure to ascertain which function of the output to be inspected has on the machine.
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