GE FANUC PROTOCOL PLC ADDRESS

[Mike@DTSI]

I have a CMM with dual ports, acting on RS-232, I am unable to complete the project as i cannot get the correct communications to go. I have setup one port as SNP, correct speeds and settings, in lookout as well, but when it comes to the PLC address do i use the CPUs SNP ID? or the port id?

Second reference, the next thing to try is the ModBus control, the GE uses RTU, how would i correctly connect to the ge with the modbus control from lookout?

[Rkdomer]

The lookout GE_Series90 object only supports SNPX (via serial), and is pretty specific about selecting either a 90-30 or 90-70 series. I'm not familiar with a CMM, but it may not communicate with the GE object in lookout. But if it does, the PLC address would be the SNP address configured for the port you are connected to on the PLC (each port can have a different address).

As for using Modbus RTU protocol, that should work great in place of the SNP protocol (works quite well for me). Here is a link that will help with the difference in register numbering.

http://www.gefanuc.com/support/plc/faq00005.htm

You will notice that not all registers are accessible using the RTU Protocol (%M is one example), but you do get the additional diagnostic tools to moni
tor communication with the Modbus object.

[DST1]

Mike,

I'm curious as to whether or not you were able to communicate with the CMM module thru SNP-X.  I don't have much experience with GE plc's but need to be able to add Lookout to an existing GE system with a 331 processor and a 311 CMM module.  Any information you could pass on regarding this would be great.

Steven

[Mike@DTSI]

We did not used SNP-X.  We used SNP.  Radio links can be trick, SNP uses a "break-sequence" to time the messages. 

Other than the radio difficulties, it was not much different than using modbus or the like.

Mike

[Mike@DTSI]

Oversite, it is in fact SNPX.

Mike

[fyrspark]

what happens to the labeling once the adresses are used in the first group of inputs and outputs,  how do you start the addresses numerically