Re: Process Record at ioc initialization with OPCUA module

[Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>]

Hi Vivien,

The bini option (behavior at initialization) determines what the driver is doing when the communication is established.

This is different from the record's PINI field which determines record processing when the IOC initializes.

bini=read (default): When the OPC UA communication is established, the value is read from the device and the EPICS record is updated.

bini=write: When the OPC UA communication is established, the value is written from the EPICS record to the device.

bini=ignore: When the OPC UA communication is established, neither the EPICS record nor the device is updated.

The bini option does not cause the record to process.

The configure action happens every time the connection comes up. (Also if the OPC UA server is started after the IOC boots or when the connection is reestablished after a communication loss.)

In your configuration, the BO gets the value from the device when the connection comes up, silently.

With monitor=y (default) your BO record is bidirectional. Changes on the EPICS side are written to the device, changes in the device update the EPICS record.

Cheers,
~Ralph

On Wed, 11 Dec 2024 at 13:12, LORIOT Vivien via Tech-talk <tech-talk at aps.anl.gov> wrote:

 

De : LORIOT Vivien
Envoyé : mercredi 11 décembre 2024 11:48
À : 'tech-talk-bounces at aps.anl.gov' <tech-talk-bounces at aps.anl.gov>
Objet : Process Record at ioc initialization with OPCUA module

 

Hi everyone,

 

I’m currently using the OPCUA epics module (with the open62541 librairy) to communicate with a PLC Siemens s7-1500 and I would have a question about the process of a BO record at initialization.

With OPCUA, it seems possible to process a record at the initialization with defining the option bini inside the OUT field :

But my BO are still not processing during the IOC init. It fonctionne well with the input record (AI and BI). Maybe I didn’t understand well the bini option ?

 

Does someone already had this problem and have a solution to propose ?

 

Sinceraly,

 

 

Vivien LORIOT

Ingénieur Contrôle-Commande

Laboratoire de Développement et d’Intégration des Systèmes de Contrôle

 

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