MohamedYasinA

PI Modbus Serial Interface Scan Skipped

Discussion created by MohamedYasinA on May 6, 2014
Latest reply on May 21, 2014 by Daniel Takara

Dear All,

 

I have 3 Interface ( Modbus Serial Interface) which is getting data from Energy Meter Through DCU. Each COM port is separately connected to individual Energy Meter. And Interface are on different node.

I have created 74 Tags for each Interface instance. Regardless of water scan class I map it up. its skipping scan class and all 3 interface are updating in frequency of 18 secs.

 

Following things have been performed.

1. Check the rate of frequency of data update through ModScan32 software and data is coming through seamlessly very second.

2. Modified scan class with offset - no luck

3. Reduced the poll delay and response timeout - no luck

4. Upgraded to lasted version of ICU and PI Modbus - no luck

5. Seggrated 74 tags with 40 tags with scan class 3sec and 34 tags with scan class 5sec

6. Tried to map 1min scan class but still its updating in 18 sec time range.

7. Disabled Buffering as well.

 

SDK Log files are showing error as, 

 

Time  ID  Severity  Message 5/6/2014 2:43:31.94501 PM  7039 Information  Connection accepted:     Process name:  PISDKUtility.exe(3364) ID: 1450  5/6/2014 2:38:05.07001 PM  4 Information  .  5/6/2014 2:38:05.07001 PM  43474 Warning  Timeout cleared on COM port 11 Node ID 1.  5/6/2014 2:38:01.52301 PM  4 Information  .  5/6/2014 2:38:01.50801 PM  43473 Warning  Timeout on COM port 11. Retries failed while trying to request data from Node ID 1.  5/6/2014 2:37:28.13301 PM  4 Information  .  5/6/2014 2:37:28.13301 PM  43474 Warning  Timeout cleared on COM port 6 Node ID 1.  5/6/2014 2:37:24.50801 PM  4 Information  .  5/6/2014 2:37:24.50801 PM  43473 Warning  Timeout on COM port 6. Retries failed while trying to request data from Node ID 1.  5/6/2014 2:36:52.07001 PM  4 Information  .  5/6/2014 2:36:52.07001 PM  43474 Warning  Timeout cleared on COM port 5 Node ID 1.  5/6/2014 2:36:48.52301 PM  4 Information  .  5/6/2014 2:36:48.50801 PM  43473 Warning  Timeout on COM port 5. Retries failed while trying to request data from Node ID 1.  5/6/2014 2:26:10.423 PM  43479 Warning  1 device(s) failed all of their retries while requesting data.  5/6/2014 2:25:37.97 PM  4 Information  . 

 

Can you please advice on the above issue please?

 

Regards,

 

Yasin - Sr.Engineer - OSI PI Automation Engineer

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