Hitachi SJ-P1 Series User Manual page 46

Chapter 7
Chapter 7 About the Modbus TCP
Contents
7.1 About this chapter ........................................... 7-1
7.2 About the Modbus TCP .................................. 7-2
7.2.1 Communication specification ................ 7-2
7.2.2 Modbus TCP frame .................................. 7-2
7.2.3 Data format ............................................... 7-3
7.2.4 Modbus function code ............................ 7-4
7.2.5 Read coils [01h] ........................................ 7-5
7.2.6 Read holding registers [03h] .................. 7-7
7.2.7 Write single coil [05h] .............................. 7-9
7.2.8 Write single register [06h] .....................7-10
7.2.9 Diagnostics [08h] ...................................7-11
7.2.10 Write multiple coils [0Fh] ....................7-12
7.2.11 Write multiple registers [10h].............7-14
7.2.12 Read/Write multiple registers [17h] ..7-15
7.2.13 Exception response .............................7-17
7.3 Conection with the ProDriveNext ...............7-19
About the Modbus TCP
7.1 About this chapter
This chapter contains information for the Modbus
TCP communication.
The P1-EN is a server device that uses Modbus
TCP communication via the network conformed
with IEEE 802.3 (10BASE-T or 100BASE-TX).
Additionally, when doing any work or operation,
always follow the safety instructions and cautions
given in the chapter 1.
7-1
7