Experimental Physics and
Industrial Control System

On 01/30/2018 03:31 PM, Simon Reiter wrote:
> after updating from EPICS 3.14.12.6 to 3.16.1 I receive the following
> message.
> A PV is set by the sequencer (2.2.4). It is actually done, but every
> time, the sequencer set the PV, I get this message.
>
>     sevr=minor ca_array_put(typeToCA(type), count, var->chid, value):
> Channel write request failed
>
> int pv_variable;
> assign pv_variable to "{IOC}:timeout:S";
> pv_variable = value;
> pvPut(pv_variable);
>
> The connected PV is binary output.

From looking at the CA sources it seems that this is ECA_PUTFAIL error
code, which is used as the default (catch-all) error code in
src/ca/client/oldChannelNotify.cpp e.g. line 525:

    catch ( ... )
    {
        caStatus = ECA_PUTFAIL;
    }

So we know that /something/ fails and it is not any of the expected
exceptions (cacChannel::badString, ... std::bad_alloc). You could insert
debug statements in the catch-all clause to print more information about
the exception.

Does a caput from the command line work also result in an error message?