Example switchover situations

The scenarios described in this section are example situations that could cause redundant Series 2 cards to switch over. They contain guidelines to help you understand what can cause a switchover and what you can do to remedy the fault. Seven situations are presented.

The subtopic links explain how to troubleshoot the possible problems listed in the table.

Card type and LED indications	Diagnostics shows an integrity error on the card and the following parameter values:	Possible problem
All Series 2 cards Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card. Red LED is off.	Status = No communication with partner PStatus = No communication between cards	Redundancy link chip failure
All Series 2 cards Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card. Red LED is off.	Status = No communication with partner PStatus = No communication between cards	Communication failure due to open or bent pin
All Series 2 cards that use field power Flashing Red LEDs Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card.	PStatus = Possible loss of field power Status = Bad - Hardware error	Brief loss of field power
Series 2 redundant Serial cards (Can affect other cards depending upon card's noise level tolerance) Flashing Red LEDs on serial cards Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card.	PStatus = No Card Status = No Card	Electrical noise on the carrier
Series 2 redundant DO, 8-Channel, 24 VDC, High-Side Flashing Yellow LEDs Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card.	Channel Status = Bad - Hardware Error Channel OInteg = Bad, Pair Status - Possible Field Problem	Open channel fault on DO card
Series 2 redundant AI, 4-20mA, HART Flashing Red LED on the former active card Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card.	PStatus = Termination Block Incorrectly Installed Status = Bad – Configuration Error	Excessive current withdrawal
Series 2 redundant H1 Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card. Red LED is off.	PStatus = Standby Card Problem	Open pin fault

Card type and LED indications

Diagnostics shows an integrity error on the card and the following parameter values:

Possible problem

All Series 2 cards

Power/Active LED on the former standby card goes to solid green indicating it is now the active card. Power/Active LED on the former active card goes to flashing green indicating it is now the standby card. Red LED is off.

Status = No communication with partner

PStatus = No communication between cards

Redundancy link chip failure

All Series 2 cards

Status = No communication with partner

PStatus = No communication between cards

Communication failure due to open or bent pin

All Series 2 cards that use field power

Flashing Red LEDs

PStatus = Possible loss of field power

Status = Bad - Hardware error

Brief loss of field power