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PROFINET IO
5.2 Configuring, parameter assignment and commissioning with PROFINET IO
Diagnostics Undervoltage
An undervoltage diagnostics is triggered when the supply voltage drops below 19.2 V.
Once the supply voltage exceeds 20.4 V again, an undervoltage diagnostics is no longer
shown.
If the voltage falls below the lower voltage limit at only one of the two feeds, the diagnostics
is not yet triggered, because measurements are taken at the common internal voltage supply
(see Block diagram (Page 34)).
The undervoltage diagnostics is displayed as maintenance interrupt according to the above
description after release via the module parameters (Interrupts (Page 55)).
Data validity display DIA
You use the data validity display DIA to determine whether or not the IO controller connected
via the PN/MF Coupler still supplies valid data from the "other" subnet.
Only activate the data validity display DIA if you have configured inputs on the relevant side
of the PN/MF Coupler. Modules for the data record transfer are not taken into consideration
for this.
The validity of the data is always displayed in bit 0 of the least significant input byte of the
PN/MF Coupler. The least significant input byte is the lowest slot number of the first input
module.
Bit 0 = 1: received data are valid.
Bit 0 = 0: received data are invalid.
Possible causes:
• An interface of the PN/MF Coupler is faulty
• The PN/MF Coupler in the other subnet has failed
• The IO controller in the other subnet is in STOP state
Incorrect program interpretation
If you have activated the "Data validity display DIA", you must not use the first bit of the first
configured input byte for input data or the associated first bit of the first configured output
byte in the other subnet for output data!
Diagnostics for data validity
You use the diagnostics for data validity to determine if the IO controller of the other subnet
is in STOP state. The online diagnostics indicates "Data invalid" for the respective slot.
This diagnostic message is selected by default and can be disabled for each interface
separately.
46
CAUTION
Hardware Installation and Operating Manual, 07/2020, A5E50018670-AA
PN/MF Coupler
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