Installation manual

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7.5 COMMUNICATION STRATEGY

The S200 Position Node product has a lot of functionality. Decisions must be made as to

how much of this should be implemented at the customer’s end of the communication

network. There may be some limitations. Most limitations can be overcome. Limitations

include;

1.) The S200 Position Node communications is based on RS232 physical layer. This

is to say that multidrop communications is not directly supported by the S200

Position Node hardware. This can be overcome with external RS485-to-RS232

converters.

2.) Changing the function of an discrete input on the S200 Position Node (Inx)

requires a Coldstart function. A Coldstart function can be a little complex on the

Modbus scheme as it requires a Manufacture-Specific Function Code and a status-

check loop. It may be better to define the input functions in the GUI and

associated drive setup configuration file and leave it static.

3.) Certain functions require Manufacturer-Specific Function Codes to execute. This

is normally not a problem unless you have a pre-manufactured terminal that has

limited communications configuration capability that can not easily support

manufacture-specific function codes. For example; Modifications to Motion Task

table requires a customized Function Code.

4.) Setup of motor parameters over Modbus is not supported. Please use the GUI

software and/or configuration backup files for setting these parameters.

5.) Variables regarding the digital inputs can be misleading. In documentation and

wiring diagrams we label the inputs DINP1 through DINP 10. In the Modbus

protocol we call these Enable through IN9. Enable relates to DINP1, IN1 related

to DINP2, IN2 relates to DINP3, etc.

6.) When using third-party Modbus software such as Modbus Poll the data types may

have to be set to Long Inverse or Float Inverse to make the data easily readable.