AutomationDirect DURAPULSE Series User Manual page 150

Chapter 5: DURA
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
5-1b DURA
PULSE
PULSE MODBUS Communications
AC Drive User Manual 1st Ed. Rev. D 05/2013