CI853 not transmitting

Hi,

We combination where we have one CI853 and we are communicating through it with 2 MODBUS line (both ports in use) and there is Phoenix serial converter. The card has to be rebooted to get communication working again every now and then. The Rx lights are blinking all the time but Tx will stop blinking at some point and then communication is not working anymore because external system will not get any data from our side. Have you any idea that is there some issue with firmware or do we have wrong settings? SW side (CCB) is happy without any errors so basically everything is going all the way to the CI853 but not further.

Thanks in advance!

Markus

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MM Rank: 1743

Asked 10 months ago

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Hi,
Please provide a screen shot of your settings - both for hardware of CI853 and application (MBConnect and MBRead). Do you have any error code of read/write blocks?
My general recommendations in that case:
under MODBUS protocol, connected to CI853 ports, use Poll Time = 0 and
create a logic for cyclic 0-1 at Req input of the read blocks, after Done output of the block - Req:=not (Done) & not (Err)

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by MM Rank: 1743 on 4/22/2019 11:21:35 AM | Like (0) | Report

Hi,

Thanks for advising. I was thinking this through yesterday again and because they can get this working with reboot I believe that there is issue with re-estashbiliment. We don't have any error code for write or read blocks. It just cut Tx at some point. Because we don't have any monitoring with WD we are not creating alarms if communication will go down.

by MM Rank: 1743 on 4/22/2019 2:44:09 PM | Like (0) | Report

Hi,

I am wondering why Tx will be disabled but Rx is working? Our HW settings are according specs and the communication is working fine after reboot so basically it should be correct. Only thing which will happen is that we will not send anything to the line after some random point after reboot. We can still read all data from the line but Tx is not flashing. SW write block is happy (WrtieDone indicated) and connection is valid. Should I reboot connection with taking Connect cmd from connect block off and back on or how we can re-establish connection with SW so that we don't have to do HW side reboot every time?

by kstoilov AKS expert

Rank: 5 on 4/22/2019 3:30:54 PM | Like (0) | Report

Yes, software reboot is possible with off / on of En_C input of Connect block. But usually in my code it is connected to TRUE (after commissioning, when I need to reset the communication until find the correct settings). Valid of connect block is TRUE even if the slave doesn't connected, so you have to look err status of read / write blocks.
In case you have Rx without Tx on Ci853 LED's, look if no other device in the line is configured as Master. There is no reason to receive an answer without request (usually :-) because Ci853 is master (usually). Look also if Phoenix converter has some settings...
Without to look in your code, I can't give more recommendations.

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kstoilov

Rank: 5

Answered 10 months ago

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CI853 not transmitting

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