7-82
7.7 Communication Function 4: MODBUS RTU
Communication
7.7.1 MODBUS RTU Communication
Function overview
•
This function is available for the 32k type only.
•
The MODBUS RTU protocol enables the communication between the FP
Σ
and other devices (including
our FP-e, Programmable display GT series and KT temperature control unit).
•
Enables to have conversations if the master unit sends instructions (command messages) to slave
units and the slave units respond (response messages) according to the instructions.
•
Enabels the communication between the devices of max. 99 units as the master function and slave
function is equipped.
About MODBUS RTU
•
The MODBUS RTU communication is a function for the master unit to read and write the data in slave
units communicating between them.
•
There are ASCII mode and RTU (binary) mode in the MODBUS protocol, however, the FP
Σ
is
supported with the RTU (binary) mode only.
Master function
Writing and reading data for various slaves is available using the F145 (SEND) and F146 (RECV)
instructions.
Individual access to each slave and the global transmission is possible.
Slave function
If the slave units receive a command message from the master unit, they send back the response
message corresponding to the content.
Do not execute the F145 (SEND) or F146 (RECV) instructions when the unti is used as a slave unit.
Summary of Contents for FP E Series
Page 1: ......
Page 16: ......
Page 17: ...Chapter 1 Functions and Restrictions of the Unit ...
Page 28: ...1 12 ...
Page 29: ...Chapter 2 Specifications and Functions of the Unit ...
Page 37: ...2 9 Circuit diagram C32 Y0 Y1 Y3 Y4 C28 Y0 Y1 Y3 Y4 Y2 Y5 to YF Y2 Y5 to YB ...
Page 48: ...2 20 ...
Page 49: ...Chapter 3 Expansion ...
Page 56: ...3 8 Terminal layout diagram Note The numbers in the connector are for the first expansion ...
Page 61: ...Chapter 4 I O Allocation ...
Page 66: ...4 6 ...
Page 67: ...Chapter 5 Installation and Wiring ...
Page 90: ...5 24 ...
Page 91: ...Chapter 6 High speed counter Pulse Output and PWM Output functions ...
Page 116: ...6 26 ...
Page 121: ...6 31 ...
Page 125: ...6 35 Pulse output diagram ...
Page 131: ...6 41 ...
Page 139: ...6 49 ...
Page 141: ...6 51 ...
Page 144: ...6 54 Program Continued on the next page ...
Page 145: ...6 55 ...
Page 147: ...6 57 Program ...
Page 151: ...Chapter 7 Communication Cassette ...
Page 210: ...7 60 The values of DT50 and DT51 are written in DT0 and 1 of PLC ...
Page 238: ...7 88 ...
Page 239: ...Chapter 8 Self Diagnostic and Troubleshooting ...
Page 247: ......
Page 248: ......
Page 249: ...Chapter 9 Precautions During Programming ...
Page 260: ...9 12 Example 2 Using the CT instruction between JP and LBL instructions ...
Page 268: ...9 20 ...
Page 269: ...Chapter10 Specifications ...
Page 286: ......
Page 287: ...Chapter 11 Dimensions ...
Page 290: ...11 4 11 1 3 Expansion Unit FPG XY64D2T FPG XY64D2P FPG EM1 ...
Page 293: ...Chapter 12 Appendix ...
Page 297: ...12 5 ...
Page 437: ...12 145 12 7 ASCII Codes ...
Page 439: ......
Page 440: ......