Freelance Ac900F with Ref601

What Is the response time for modbus communication between AC900F controller and ABB Ref 601 protection relay

it took very long time to response even digital Actions.

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Reda Rank: 267

Asked 4 years ago

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Hi,

Need more information.

is it on modbus tcp/ip or over modbus rtu ?

Incase of modbus rtu what baudrate you are communicating? if baudrate and other configuration matching both the side should not take long time. in your case it takes time in 1-2 seconds ? or even slower then that ?

I tried to establish AC900F and some third party device over modbus TCP communication was at reasonable speed, didn't observed any lag or slow response.

Is there any retires or error count while communicating? Check at hw tree select interface object and at lower pen one can observe if there any communication issues

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by Reda Rank: 267 on 11/2/2014 3:53:45 AM | Like (0) | Report

Serial RTU
the baud rate is 19200
and the communication is verified but very slow some times take more than 30 second and other time freezing until we download the controller again

by Sumit Gargav AKS expert

Rank: 3 on 11/2/2014 4:08:44 AM | Like (0) | Report

try following,
Check lower pen statistics, if there is any timeouts or error ?
keep only one line(ser1/ser2) active and check if that works better ?
both the side baudrate is 19200? or it's only at ac 900F side ?

by Reda Rank: 267 on 11/2/2014 4:56:32 AM | Like (0) | Report

both sides are the same configuration

by Sumit Gargav AKS expert

Rank: 3 on 11/2/2014 6:18:28 PM | Like (0) | Report

can you please also confirm on lower pen statistics, any timeout/error count ? also try with only one line active. reply back with your observation.

by Reda Rank: 267 on 11/3/2014 4:36:09 AM | Like (0) | Report

STA gives 5 and 6
no error
we already work with one line only but
we have about 20 Ref
what is the maximum device No.per network

by Sumit Gargav AKS expert

Rank: 3 on 11/5/2014 7:09:17 PM | Like (0) | Report

hi, Sorry for delayed reply,
Looks like it's heavy traffic or more number of slaves connected on single line,
check if that works for modbus master R/W blocks
1. Increase timeout period default is 2000 ms try with 3000ms ot 4000ms.
2. Increase retires default is 1, try 2 or 3.
3. reduce number of slave one by one and check if communication improves.
I have worked with AC 800F, upto 12 slaves, each slaves reading 6-7 signals. on 9600 baudrate. was communicating healthily. In your case do trial and error, reduce slave one by one and check upto how many slaves it can communicate best. pls do come back with your findings.

by Reda Rank: 267 on 11/5/2014 11:28:14 PM | Like (0) | Report

Ok thanks

by Sumit Gargav AKS expert

Rank: 3 on 11/19/2014 6:41:21 PM | Like (0) | Report

is it solved ? or what was the issue ?

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Sumit Gargav AKS expert

Rank: 3

Answered 4 years ago

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Freelance Ac900F with Ref601

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