Experimental Physics and
Industrial Control System

Hi Zhenhua,

The value in the database file will be replaced by the value read from the device. 

There are 2 ways to force the value to zero when the IOC start up:

- Add the PV to autosave and set the value to 0 before the IOC reboots. The value in autosave will be written to the device if PINI=1.
- Put a dbpf command after iocInit which writes zero to the PV.

Mark


Sent from my iPhone

> On May 24, 2021, at 7:39 PM, 高振华 <gaozh at ihep.ac.cn> wrote:
> 
> Hi Mark,
> I tried to set BO PV to zero when starting Modbus R2-11 IOC, but failed. PINI worked, but VAL didn't work.When IOC is started, what is written to PLC is the value that has just been read.
> Can't the Modbus R2-11 driver set BO PV to zero when IOC starts?
> 
> Best regards.
> Gao Zhenhua
> 
> --
> BSRF(Beijing Synchrotron Radiation Facility)
> Email:gaozh at ihep.ac.cn
> 
> 
> 

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