ICP DAS USA tET Series User Manual page 4

Ethernet I/O Modules
5 I/O Pair Connection Applications .......................................................................................... 92
5.1 Set a Single Module to Pull/Push Mode (DI/DO) ................................................................ 92
5.1.1 Pull Mode ................................................................................................................ 94
5.1.2 Push Mode .............................................................................................................. 95
5.2 Set Two Modules to Push Mode (Local DI to Remote DO) ................................................. 96
5.3 Set Two Modules to PULL Mode (Remote DI to 2-Local DO) .............................................. 99
5.4 Set Two Modules to Push Mode (2-Local DI to Remote DO) ............................................ 102
5.5 Shared Memory ................................................................................................................. 105
5.5.1 Address Mapping for Shared Memory.................................................................. 106
5.5.2 Application of Spreading the Load ........................................................................ 107
5.5.3 Master/Slave/MTCP/MUDP Data Exchange ......................................................... 109
5.5.4 Bits / Registers Data Exchange .............................................................................. 110
6 Modbus Information .......................................................................................................... 111
6.1 What is Modbus TCP/IP? ................................................................................................... 112
6.2 Modbus Message Structure .............................................................................................. 112
6.2.1 01(0x01) Read the Status of the Coils (Readback DOs) ........................................ 116
6.2.2 02(0x02) Read the Status of the Input (Read DIs) ................................................ 118
6.2.3 03(0x03) Read the Holding Registers (Readback AOs) .......................................... 120
6.2.4 04(0x04) Read the Input Registers (Read AIs) ...................................................... 122
6.2.5 05(0x05) Force a Single Coil (Write DO) ............................................................... 124
6.2.6 06(0x06) Preset a Single Register (Write AO) ....................................................... 126
6.2.7 15(0x0F) Force Multiple Coils (Write DOs) ........................................................... 128
6.2.8 16(0x10) Preset Multiple Registers (Write AOs) ................................................... 130
6.3 Modbus Register Table (For DI/DO Module) .................................................................... 132
6.3.1 Common Functions ............................................................................................... 132
6.3.2 Specific Functions ................................................................................................. 134
6.4 Modbus Register Table (For AI Module) ........................................................................... 139
7 Related Tools ...................................................................................................................... 142
7.1 LabVIEW ............................................................................................................................ 142
7.2 OPC Server ........................................................................................................................ 142
7.3 SCADA ................................................................................................................................ 143
Appendix: Troubleshooting ....................................................................................................... 145
A: How can I Factory Reset the Module (Password: Admin)? .................................................... 145
Revision History .........................................................................................................................147
ICP DAS CO., LTD. tET/tPET IO Series User Manual, Ver. 2.4, Sep. 2023, P4