Yokogawa JUXTA VJ Series Limit Alarms - Manual (Page 8)

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IM 77J01J11-01E
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4. Ladder Communication .......................................................................... 4-1
4.1 Overview .......................................................................................................... 4-1
4.2 Commands/Responses at the PLC ................................................................ 4-2
4.2.1 Command/Response Component Elements ..................................... 4-2
4.2.2 Reading Parameters ......................................................................... 4-3
4.2.3 Response Error Codes ..................................................................... 4-4
5. MODBUS Communication ...................................................................... 5-1
5.1 Overview .......................................................................................................... 5-1
5.1.1 Configuration of Message ................................................................. 5-2
5.1.2 Specifying D Registers ...................................................................... 5-3
5.2 Function Codes ............................................................................................... 5-4
5.2.1 List of Function Codes ...................................................................... 5-4
5.2.2 Response Error Code[Response] ..................................................... 5-8
5.3 Example of Setting up Commercially Available SCADA Software ............... 5-9
6. Functions and Usage of D Registers ..................................................... 6-1
6.1 Overview of D Registers ................................................................................. 6-1
6.2 Interpretation of D Register Map Table .......................................................... 6-1
6.3 D Register Map Table ...................................................................................... 6-2
6.3.1 Contents of D Registers .................................................................... 6-3
7. Functions and Usage of I Relays ........................................................... 7-1
7.1 Status ............................................................................................................... 7-2
Appendix Table of ASCII Codes (Alphanumeric Codes) ............................App.-1
Revision Information ............................................................................................ i
3rd Edition : Oct. 15, 2007-00