Maple-systems HMI5000 Series Manuel d'utilisateur télécharger pdf (Page 198)

192 EZware5000 Series Programming Manual

1010-1007, Rev. 10

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

Read Coil Status

Read Input Status

Read Holding Registers

Read Input Registers

Force Single Coil

Preset Single Register

Force Multiple Coils (LB addresses in the HMI only, not compatible with bits in a PLC)

Preset Multiple Registers

HMI Local Word LW9288 indicates Modbus communication errors:

Value

Error

No error

Attempt to read/write an undefined register

Illegal Data Value

Bad Command Format

Attempt to write to a Read-only register

Attempt to read to a Write-only register

Timeout

Invalid Function Code

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Maple-systems HMI5000 Series Manuel d'utilisateur Page 198