Modbus Register And Bit Value

[ledbelly2142]

I have a modbus registry value that is the status of 5 relays in bit representation... the bit values indicate the on/off stat of the relays in order (e.g. 1, 2, 3, 4 ,5).

The variable value component reads the binary notation and converts it into a number, which I think is normal. So when some of the relays are on, I get a value of "9".

How can I display the registry value in bit representation, and how can I make it useable for logging relay run time?

I would like to log relay 1 runtime, relay 2 runtime, etc...

Thanks

[AzeoTech]

Best bet is to create 5 test channels, one for each bit, then in the Modbus channel's event, put something like:

private bits = to.bit(myChannel[0])

bitChannel0.addvalue(bits[0][0])

bitChannel1.addvalue(bits[0][1])

etc...

[ledbelly2142]

I'm not doing something right. The bits are not accurate and some are -0...

Here is what I have in the channel (channel=RelayStatus) event:

private bits = to.Bit(RelayStatus[0])

Relay1.addvalue(bits[0][0])

Relay2.addvalue(bits[0][1])

Relay3.addvalue(bits[0][2])

Relay4.addvalue(bits[0][3])

Relay5.addvalue(bits[0][4])

I am think that the second [0] in the Relay.addvalue lines identifies the bit (sequentially) in the registry value. But I also thought that using [0][0] together was identifying a two dimensional array.

Thanks

[ledbelly2142]

Just reread the documentation, the bit order is from the LSB (least significant bit)... so the first relay (I think) should be

Relay1.addvalue(bits[0][7])

Relay1.addvalue(bits[0][6])

but this does not work either. I have some formatting issue, the bit values seem random with -1, -0, 0, and 1.

[AzeoTech]

Actually, you want [0][0] because you want the LSB (right most).

If you get random values between -1 and 1 it means you forgot to set the Timing of the Test channel to 0.

[ledbelly2142]

That is right, my timing in the test channels were wrong. Thank you.

So the [0][0] bit is LSB, would have taken me a while to figured that out.

Cheers