Current/Load Calculation for S800I/O - AO Card goes to error in a redundant configuration
800XA 5.1 Rev D
How the load calculation for S800 redundancy I/O is done ?
We have cluster with 6 redundancy set of AO card (AO845) , fully AO cluster - but always one Card goes to error mode in the redundant set.
How the load calculation for S800 redundancy I/O is done ?
We have cluster with 6 redundancy set of AO card (AO845) , fully AO cluster - but always one Card goes to error mode in the redundant set.
- we are facing issue with one cluster , where we have 6 redundancy AO card 75% channel is utilized.
- some of the cable length is 550 meter with 1mm2 cable
- When plant is shutdown and remove/reset the card the I/O error is disappears , as soon as the plant start then the AO output will be close to 20mA the cards goes to fault again.
Asked 2 months ago
Answers
0
Hi,
According to the manuals, 12 modules AO845 in one cluster (or 6 redundant pairs) should not exceed the power supply limits.
In your case it is 12*125mA = 1,5A from 5VDC of modulebus.
External 24VDC required for the modules is 12*165mA = 1,98A including load current (check your external 24VDC power supply module)
Look in table 24 in 3BSE020923-600A for example
I think you have to look for the problem not in configuration, but somewhere outside, if the cluster is working fine at idle state.
Unfortunately you have provided too limited information - what is the error code/description, what is your cluster configuration/cluster modem, is the problem all the tie in the same module, or in random modules from the cluster?
According to the manuals, 12 modules AO845 in one cluster (or 6 redundant pairs) should not exceed the power supply limits.
In your case it is 12*125mA = 1,5A from 5VDC of modulebus.
External 24VDC required for the modules is 12*165mA = 1,98A including load current (check your external 24VDC power supply module)
Look in table 24 in 3BSE020923-600A for example
I think you have to look for the problem not in configuration, but somewhere outside, if the cluster is working fine at idle state.
Unfortunately you have provided too limited information - what is the error code/description, what is your cluster configuration/cluster modem, is the problem all the tie in the same module, or in random modules from the cluster?
Source: 3BSE020923-600A
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