Device RTU & TCP is live testing

[svego]

Hi,

What is the best way to test connectivity of RS485 and TCP devices ?

I want to test devices and if connection fails (like wire broken, radio connection lost etc ) device will be on alarm list..?

I guess that result can be added to virtual channel like 0 or 1 for each device ??

[AzeoTech]

The easiest way is to simply look at the time stamp on one of the channels you are reading and see if it has been awhile:

systime() - myChannel.time[0] > 2

for example would == 1 if no data had come into myChannel in the last 2 seconds.

[svego]

you mean like one sequence ...infinite loop that check one channel of each device ?

What if I want to display LED component and show with red / green light, this example is not appropriate  ???

[AzeoTech]

There are lots of ways.  You can put that expression right in the LED component if that's the only place you want it.  Other people will put it in a loop they already have or create a new loop and assign the result to a global variable that the LED component accesses.  Then they can add logic as well to actually do something when comms fails like attempt to reinit the port.  

[svego]

hi,

I tried to put that expression in LED component ...

systime() - x_300_temp1.time[0] > 2,

but value of that expression is changing 0 to 1, so LED is blinking from red to green and vice versa

any suggestion ?

 

 

[AzeoTech]

How often is x_300_temp1 updated?  

[svego]

[AzeoTech]

The timing is 2, so you need to make it > 4 or something BIGGER than 2.

[svego]

so simple, but didn't think about it..

 

THX..it works