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192 EZware5000 Series Programming Manual
Chapter 13 Using the Modbus Gateway
The Modbus Gateway allows any ModbusTCP Master to request HMI data using standard Modbus commands. The
HMI uses the ModbusRTU/TCP Slave protocol to pass Modbus requests to any non-tag-based PLC or controller
connected to the HMI, or the HMIs internal storage.
Tag-based PLCs are those that use named tags instead of addresses, such Allen Bradley Compact and
Control Logix , Siemens S7-1200, and BACnet.
For example, the Modbus Gateway would allow a SCADA system to obtain data from a device that is not supported
by the SCADA system, but is supported by the HMI. The Modbus Gateway also allows serial-connected devices access
to the SCADA system.
The Modbus Gateway support the following Modbus function codes (decimal):
Code
Definition
1
Read Coil Status
2
Read Input Status
3
Read Holding Registers
4
Read Input Registers
5
Force Single Coil
6
Preset Single Register
15
Force Multiple Coils (LB addresses in the HMI only, not compatible with bits in a PLC)
16
Preset Multiple Registers
HMI Local Word LW9288 indicates Modbus communication errors:
Value
Error
0
No error
1
Attempt to read/write an undefined register
2
Illegal Data Value
3
Bad Command Format
4
Attempt to write to a Read-only register
5
Attempt to read to a Write-only register
6
Timeout
7
Invalid Function Code
1010-1007, Rev. 10
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