JUMO 705030 mTRON T - Digital Input/Output Module Operating Manual - Manual (Page 27)

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4 Electrical connection
4.4 Functional test
The voltage supply must be tested on completion of the electrical connection:
Startup
The check described above completes the process of installation and electrical connection. For
startup, use the additional documentation (operating manual or system manual).
The "Introduction" section of this document contains an overview of all documentation for the
measuring, control, and automation system.
Signal Meaning
LED "P" (Power, green) is lit The module is being supplied with voltage
through the side contacts.
LED "P" (Power, green) is not lit The module is not supplied with voltage or there
is a problem with the electrical function of the
LED.
Remedy:
•
Check the voltage supply to the side contacts
of the preceding module (top contact +24 V,
bottom contact GND).
• Check voltage supply at the "+24 V" and
"GND" terminals of the base unit or router
module.
• Check power supply unit and connection be-
tween the power supply unit and the base unit
or router module.
If the "Power" LED does not light up despite a
voltage supply being present, the module insert
or – if the bus board inside the case is faulty – the
entire module must be replaced.