Service Manual TNC 407 / TNC 415 - heidenhain - DR. JOHANNES ...

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17.2 Checking the PLC Inputs and Outputs
Two test units are available to check the inputs and outputs of the PLC:
PLC Test Unit for X41, X42 and X46
PL Test Adaptor for the PL board
SERVICE MANUAL TNC 407/415
Issue: 01.09.1995
Page 80
With the PLC Test Unit all inputs and outputs of a connector are displayed simultaneously and all voltages can
be measured. If you use the PL Test Adaptor, only the inputs/outputs of one terminal strip of the PL board are
displayed. In this case the voltages can be measured directly at the terminals.
17.2.1 PLC Inputs
Check the PLC inputs as follows:
Connect the test unit between LE and PLC or between LE and PL.
Set the TNC as follows:
Press key Function
Switch TNC to operating mode EDITING
w
(key on VDU)
Prepare TNC for code number input
m
Enter code number, acknowledge with ENT
000000 =
Soft key >TABLE< to display the tables
Soft key >INPUT< to display the input table
Now the logic states of the inputs are displayed on the screen. The states of the screen display must
correspond to those of the test unit. If there is a difference, measure the voltage level (see section 17.1) of
this input at the test unit. If the input voltage is correct, the input board is probably defective (IO to 131 and 1128
to 1152 of PLC and graphics board, I64 to 11’26 of PLC I/O board).