Experimental Physics and
Industrial Control System

Folks,

 

I am seeing behavior I don’t understand with the sequencer.  I am using base 7.0.6.1 and sequencer 2.2.9 (latest).

 

I have a VxWorks IOC running a number of motors.  All of the motor records are loaded, but currently one of the motor controllers is not available, so that motor record is not functional.

 

I am running an SNL program on a Linux IOC,  and it connects to the motors on the VxWorks system, including the currently non-functional motor.  The SNL program puts monitors several of the motor record fields.

 

I see the following messages after iocInit when the SNL program starts:

 

seq BM13_Energy, "E=13BMA:E, MONO=13BMA:m17, EXPTAB_Z=13BMD:m22, YXTAL=13BMA:MON:, ZXTAL=13BMA:m14"

sevr=info Sequencer release 2.2.9, compiled Wed May 10 16:25:47 2023

sevr=info Spawning sequencer program "BM13_Energy", thread 0x2c304a0: "BM13_Energy"

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=26, monitored=24, got monitor=21

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=26, monitored=24, got monitor=21

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=26, monitored=24, got monitor=21

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=26, monitored=24, got monitor=21

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=26, monitored=24, got monitor=21

 

The SNL program has monitors on 3 record fields for the non-functional motor.  I think that is why there are 24 channels monitored, but only 21 monitors have been received?

 

The above seems like it might be normal.  However, after about 30 seconds I get this error on the Linux IOC:

CA.Client.Exception...............................................

    Warning: "Virtual circuit unresponsive"

    Context: "ioc13bma.cars.aps.anl.gov:5064"

    Source File: ../tcpiiu.cpp line 926

    Current Time: Wed May 10 2023 16:53:37.844955871

 

At the same time I get this error on the VxWorks IOC:

 

DB CA Link Exception: "Virtual circuit disconnect", context "corvette:38399"

 

After the exceptions I then get the following messages on the Linux IOC.   Note that it spontaneously dropped 24 of the 26 connections, and “got monitor” changed to -1.

 

..................................................................

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=2, monitored=24, got monitor=-1

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=2, monitored=24, got monitor=-1

sevr=minor BM13_Energy[0](after 0 sec): assigned=26, connected=2, monitored=24, got monitor=-1

 

Is this behavior expected?

 

Thanks,

Mark