Chapter 5: DURAPULSE MODBUS Communications
5–1b
Contents of this Chapter (continued from previous page)...
DirectLOGIC Modbus Ladder Programming . . . . . . . . . . .5–38
Separate Run Command Write Instruction . . . . . . . . . . . . . . . . . . . . . .5–38
Block Transfer Parameters for Modbus Programs . . . . . . . . . . . . . . . . .5–38
DirectLOGIC Basic Communication Program – start with this code . . .5–39
Programming Differences for DirectLOGIC PLCs . . . . . . . . . . . . . . . . .5–40
RX/WX Instructions for DL05, D2-250(-1), D4-450 . . . . . . . . . . . . . . . . . . . .5–40
MRX/MWX Instructions for DL06, D2-260 . . . . . . . . . . . . . . . . . . . . . . . . . . .5–40
DL MRX/MWX Communication Program – for DL06 & D2-260 PLCs .5–41
DL RX/WX Communication Program – for DL05, D2-250(-1), D4-450 5–54
Communicating with Third-party Devices . . . . . . . . . . . . .5–67
Common Third-party MODBUS RTU Masters . . . . . . . . . . . . . . . . . . .5–67
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–68
Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–69
CMD (Command code) and DATA (data characters) . . . . . . . . . . . . . .5–70
Comm Delay – Optimizing Communications . . . . . . . . . .5–74
Optimizing Communications to GS Drives . . . . . . . . . . . . . . . . . . . . .5–74
Types of Messages Sent to GS Drives . . . . . . . . . . . . . . . . . . . . . . . . . .5–75
Format of “Read Registers” Messages: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–75
Format of “Write Multiple Registers” Messages: . . . . . . . . . . . . . . . . . . . . . . .5–75
Format of “Write Single Register” Messages: . . . . . . . . . . . . . . . . . . . . . . . . .5–75
Example Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–75
Additional Message Delay Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–76
Modbus-specified Delays Between Messages . . . . . . . . . . . . . . . . . . . . . . . . .5–76
Other Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–77
Communication Delay Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–77
Communication Delay Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5–78
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013
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