Absolute Encoder

[kamenges]

I don't know how recent is 'recent' for you, Peter. The CPS instruction has been around at least since Version 10, which I believe is about 2 years old.
I also got spanked by using the COP instruction in CLX withoput actually considering what it meant. The CPS instruction solved a couple of odd, intermittent issues I was having, once I knew it was there and understood what it solved. Being a PLC5 guy, I never even considered a COP could get screwwed up.
BTW, it was a post here that put me on to the CPS instruction. This really is a useful place for such info.

Keith

 

[DoubleL]

I was able to get this working today by using Ken's method. I've tried to attach the ladder showing it. It worked great. Thanks for all the help.

BST MOV Oven_Flex_IO:2:I Encoder_holding_register2[0] NXB XIC Single_shot_on.29 NOT Encoder_holding_register2[0] Encoder_holding_register2[0] NXB XIC Single_shot_on.30 MOV 0 new1 BND 

BST XIC Encoder_holding_register2[0].9 OTE new1.9 NXB BST XIC new1.9 XIO Encoder_holding_register2[0].8 NXB XIO new1.9 XIC Encoder_holding_register2[0].8 BND OTE new1.8 NXB BST XIC new1.8 XIO Encoder_holding_register2[0].7 NXB XIO new1.8 XIC Encoder_holding_register2[0].7 BND OTE new1.7 NXB BST XIC new1.7 XIO Encoder_holding_register2[0].6 NXB XIO new1.7 XIC Encoder_holding_register2[0].6 BND OTE new1.6 NXB BST XIC new1.6 XIO Encoder_holding_register2[0].5 NXB XIO new1.6 XIC Encoder_holding_register2[0].5 BND OTE new1.5 NXB BST XIC new1.5 XIO Encoder_holding_register2[0].4 NXB XIO new1.5 XIC Encoder_holding_register2[0].4 BND OTE new1.4 NXB BST XIC new1.4 XIO Encoder_holding_register2[0].3 NXB XIO new1.4 XIC Encoder_holding_register2[0].3 BND OTE new1.3 NXB BST XIC new1.3 XIO Encoder_holding_register2[0].2 NXB XIO new1.3 XIC Encoder_holding_register2[0].2 BND OTE new1.2 NXB BST XIC new1.2 XIO Encoder_holding_register2[0].1 NXB XIO new1.2 XIC Encoder_holding_register2[0].1 BND OTE new1.1 NXB BST XIC new1.1 XIO Encoder_holding_register2[0].0 NXB XIO new1.1 XIC Encoder_holding_register2[0].0 BND OTE new1.0 BND 

 

[DoubleL]

Well source code didn't work so you can paste that into Rs
logix 5000 if you want.

 

[Colossalnut]

I was leaning towards Kens' suggestion also. Happy to hear that it worked for ya!

 

[Unregistered]

Your 845G encoder has 'high true' outputs. The input module you are using is a 'low true' type. The module is inverting the encoder data. Use a "NOT" inversion statement in ladder logic before your gray to binary conversion.
Inverted gray code does not properly convert with this ex-or type ladder conversion.