Behavior Of Pgm During Fault Scenarios; Loss Of Communication Between Pgm And C300; Loss Of Communication Between Pgm And Slave Device - Honeywell Experion PKS User Manual

13 PROFIBUS GATEWAY MODULE (PGM) TROUBLESHOOTING

13.1 Behavior of PGM during fault scenarios

This section provides information on the behavior of the PGM under various scenarios such as power off,
communication loss with the devices, communication loss with the C300 Controller and so on.
Related topics
"Loss of communication between PGM and C300" on page 250
"Loss of communication between PGM and slave device " on page 250
"Loss of communication between the PGM and control strategies" on page 251
"CEEC300 state is changed to Idle " on page 251
"Inactivation of PIOMB" on page 251
"Deletion of PIOMB" on page 251
"PGM power failure" on page 252
"Removal of PGM from IOTA" on page 252
"Mismatch of the slave device and the master addresses" on page 252
"Experion server switchover" on page 252

13.1.1 Loss of communication between PGM and C300

This communication loss can occur when both the FTE cables are removed from the non-redundant PGM.
Attention
Even if one of the FTE cables are removed or is faulty, the PGM can still communicate with the devices on network.
The following table illustrates the behavior of the DSB and the PIOMB blocks when there is a communication
loss between the PGM and the C300 Controller.
DSB
Input side behavior
• The DSB is informed of the communication
loss.
• The connections are removed.
• The PGM stops data updates to the associated
PDCs.
Output side behavior
• The fail-safe value of the device is set on the
DSB block.

13.1.2 Loss of communication between PGM and slave device

This communication loss between the PGM and the slave devices can occur in the following scenarios.
• The PROFIBUS cable is removed from the PGM.
• The slave devices are not configured properly.
• The slave devices are broken.
The following table illustrates the behavior of the DSB and PIOMB blocks in the event of a communication loss
between the PGM and the slave device.
250 www.honeywell.com
PIOMB
Input channels
• Input Channels will be set to fail-safe values (NaN and OFF for
analog and digital values respectively).
• Channel value status is set to "Bad."
• The associated function blocks react to the fail-safe data.
Output channels
Output Channel will request the upstream blocks to go into
initialization (INITMAN parameter should be set to "ON" for the
PID and DEVCTL blocks).