•
Check the actual state of the connected binary inputs.
•
In LHMI, select
Main menu/Tests/I/O modules
. Then navigate to the board
with the actual binary input to be checked.
•
With PCM600, right-click the product and select
Signal Monitoring
. Then
navigate to the actual I/O board and to the binary input in question. The
activated input signal is indicated with a yellow-lit diode.
•
Measure output contacts using the voltage drop method of applying at least the
minimum contact load given for the output relays in the technical data, for example
100 mA at 24 V AC/DC.
Output relays, especially power output relays, are designed for
breaking high currents. Due to this, layers of high resistance may
appear on the surface of the contacts. Do not determine proper
functionality of connectivity or contact resistance by measuring with
a regular hand-held ohm meter.
A
1
2
3
4
V
GUID-BBAEAF55-8D01-4711-A71D-BBC76B60BA3D V1 EN
Figure 19:
Testing output contacts using the voltage drop method
1 Contact current
2 Contact voltage drop
3 Load
4 Supply voltage
Section 8
1MRK 505 293-UUS A
Troubleshooting
130
Commissioning manual
