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Fixing Common Problems - Honeywell Experion PKS User Manual

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13 PROFIBUS GATEWAY MODULE (PGM) TROUBLESHOOTING

13.4 Fixing common problems

This section identifies some common problems and describes how you might fix them.
Loss of communication with the devices when a switchover is initiated
Diagnostic Check
Cause
Solution
Loss of connection to some of the field network slave devices
Diagnostic Check Slave devices that are not communicating with the PGM have their status as "Bad."
Cause 1
Solution
Cause 2
Solution
Cause 3
Solution
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Loss of communication with the slave devices when a switchover is initiated.
Probable PROFIBUS master configuration (bus parameters) errors. For example, Watchdog
Control Time and Data Control Time are not configured properly.
Modify the Watchdog Control Time and data control time based on the Baud Rate.
The following table lists the various Baud Rate and the recommended Watchdog Control
Time and the Data Control Time.
Attention
These values may differ based on the number of slave devices configured in the
network.
For the slave devices that have DP-V1 enabled, the Watchdog Control Time and
the Data Control Time must be three times longer than the actual time when DP-
V1 is disabled.
By default, the ET200M devices have DP-V1 enabled.
Baud Rate
1500
500
187.5
93.75
45.45
19.2
9.6
Network or power supply wiring problems in the field network.
Open the Protocol Block detail displays to check the slave devices that are not communicating with
the PGM.
Obtain the field network wiring diagram and slave device power supply schematics.
Fix the problematic network wiring or power supply wiring manually.
Otherwise, go to Cause 2.
Slave devices are not configured properly.
Check for the slave device configurations and correct the configurations, if any.
Otherwise, go to Cause 3.
Slave devices are broken.
Replace the broken slave devices one by one.
Watchdog Control Time
1000
1000
2000
3000
4000
5000
6000
Data Control Time
6000
6000
12000
18000
24000
30000
36000

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