Setting a timer preset from the HMI

[sa747sp 0]

Anyone know how to send the timer preset values from the HMI, I want to be able to change a timers preset. HMI is Panel View Plus Software is RSlogix 5000 Thanks

[paulengr 44]

You could select the timer structure.PRE tag and write to it directly, realizing that it's in milliseconds. Second method is to create a floating point tag that the HMI accesses, and to scale it and move it into the appropriate timer register. There are two reasons that the PLC option would be better anyway. First, you've got some indirection. You can redirect the value some place else and generally change the code without any effect on the HMI (separation of concerns). Second, you can verify that the value is non-negative, and scale it with a MUL instruction. Theoretically, checking for illegal values is better left handled in the HMI but the reality is that this does not always get done.