HEIDENHAIN TNC 415 (259 9x0) Service Manual - Manual (Page 140)

SERVICE MANUAL TNC 415B/425
Page 135
Issue: 20.08.95
19.3.2 PLC Outputs
The PLC outputs can be checked as follows:
•
Connect the test unit between the PLC and the LE (measure directly at the PL boards).
Press Key Function
MOD
8 0 7 6 6 7
ENT
TNC in operating mode PROGRAMMING/EDITING
Prepare TNC for input of code number
Enter code number, confirm with ENT
Call TABLE function
Display of output table
Now the logic states of the outputs are displayed on the screen. They must correspond to the voltage levels
of the corresponding outputs. If there is a difference, check the output cable for short circuit and measure
the output current at the interface (max. 100 mA for LE outputs, max. 1.2 A for PL outputs). If the output
current is not exceeded and connecting cable is in order, the output board of the PLC graphics board or the
PLC I/O board PL 400/405/410 is defective.
Exit the TABLE function
TNC in operating mode PROGRAMMING/EDITING
*
Observe the safety instructions!