A.2 Protocol Description
Appendix A: Communication
282
493-0736-11 (6-2)
Recommended max number of units per master system is 10 slaves. This is due
to the response time when cyclically requesting information from all slaves.
A.2 Protocol Description
Modbus Communication
Function Codes
ECA can only work as a MODBUS slave and supports the following MODBUS
function codes.
Message codes [01] and [02] are treated as a read operation in the ”I/O RAM
Map” in the ECA.
Message codes [03] and [04] are treated as a read operation in the ”Register Map”
in the ECA.
Message code [05] is a write operation in the ”I/O RAM Map” (write single bit).
Message code [06] is a write operation in the ”Register Map” (write single
register).
Response Codes
ECA supports the following response codes:
Code
Designation
Function
01
Read Coil Status
Read binary values
02
Read Input Status
Read binary values
03
Read Holding Registers
Read registers (16 bits Integer)
04
Read Input Registers
Read registers (16 bits Integer)
05
Force Single Coil
Write/Set a single register value (1 bit)
06
Preset Single Register
Write/Set a single register value (16 bits
Integer)
Code
Name
01
Illegal function
Summary of Contents for ECA06
Page 1: ...Version 1 05 ECA06 60 600 EMA60 Configuration and Installation ...
Page 2: ......
Page 3: ...ECA06 60 600 EMA60 Configuration and Installation ...
Page 10: ...Contents vi 493 0736 11 6 2 ...
Page 16: ...1 5 Version information Chapter 1 Introduction 16 493 0736 11 6 2 ...
Page 200: ...4 2 Annual Check Chapter 4 Maintenance 200 493 0736 11 6 2 ...
Page 286: ...Appendix A Configuration Work Sheets 282 493 0736 11 6 2 ...
Page 304: ...B 1 Total Reset Appendix B Special Modes 298 493 0736 11 6 2 ...
Page 308: ...Index 302 493 0736 11 6 2 ...
Page 309: ......