Polling RTU's

[Prana]

Can Lookout 6.7.1 display the time that an RTU was last polled in a system? Thank you in advance for your help.

[Rkdomer]

Yes, by using the update data member.  The update member goes low when Lookout sends a request and goes (and remains) high when it receives a reply.  Lots of ways to accomplish this, one example is:

text(now(Modbus1.update), "yyyy-mm-dd hh:mm")

[Prana]

Thank you. I will look into this. If I have any issues, I may be back to ask more questions if that is okay.

[Prana]

so do I just create an expression using the example you gave me? Also, is there an easy way to manually poll a site? Thank you so much for your help.

[Rkdomer · Accepted solution]

Yes, an expression object would work.  That would be good if you display it more than one place.  I work mostly with Modbus objects but I think most if not all PLC objects behave the same.  There are two polling writable data members (yellow fields) - pollrate and poll.  pollrate is a time interval and poll is a discrete.  A pushbutton (or any true condition) could be used to poll the device. 

[Prana]

Thank you so much. you have been a real big help. You rock.

[Prana]

I hate to ask dumb questions, but by using the Poll data members, is this confirming actual radio communications to an RTU?