July 2010 11 – 121
Figure: Measuring at a terminal of the I/O module PLD 16-8 using a needle tip probe
Assignment --> See “Connector Designation and Layout” on page 27 – 447.
Conclusion The logic states in the PLC-TABLE must be in agreement with the voltage levels for each
input. --> See “Specifications” on page 11 – 147!
If there is a difference (e.g., the voltage level is within the tolerance range but the logic state is
0), you can narrow further the error cause.
An active input is signalled by a yellow LED at the PLD 16-8.
It is not possible to measure PLC inputs directly at the handwheel or at the cable adapter
for the handwheel!
If the HEIDENHAIN test adapter is available, you can connect it between the connectors
X42 and X45 of the MC to measure the voltage level of the input to be checked. --> See
“Measuring circuit with test adapter for PLC inputs and outputs on the MC” on page 11 –
124.
To Next Page
Loading...
