Supported Modbus Functions And Register Types - Siemens SIPROTEC 4 Manual

Characteristic of the ModbusTCP Module

1.3 Supported Modbus Functions and Register Types

1.3

Supported Modbus Functions and Register Types

The Modbus TCP interface of the SIPROTEC 4 device supports the following function and register types:
Function Function Name
Code
1 Read Coil Status
(0X references)
2 Read Input Status
(1X references)
3 Read Holding Registers
(4X references)
4 Read Input Registers
(3X references)
5 Force Single Coil
(0X references)
7 Read Exception Status This function responds the value of the 8 Coil Status regis-
15 Force Multiple Coils
(0X references)
16 Preset Multiple Regs
(4X references)
NOTE
i
i
Broadcast messages from the Modbus master to the Modbus slaves using slave address 0 in the Modbus
message.
Type Number
0
1
3
14
Description
Reading 1 or several Coil Status registers of the Modbus
slave.
The Coil Status registers reflect the ON/OFF status of
discrete outputs of the SIPROTEC 4 device.
Reading 1 or several Input Status registers of the Modbus
slave.
The Input Status registers reflect the ON/OFF status of
discrete inputs and the status of the protection function of
the SIPROTEC 4 device.
Reading 1 or several Holding Registers of the Modbus
slave.
The Holding Registers contain device-status information,
mean values of measured values, metered measurands
and others.
Reading 1 or several Input registers of the Modbus slave.
The Input registers contain recorded measured values.
Writing (force to ON or OFF) 1 Coil Status registers (and
the assigned binary input of the SIPROTEC 4 device).
Use function code 15 to force multiple Coil Status registers.
ters 257..264 as Exception Status to the Modbus master.
Writing (force to ON or OFF) 1 or several Coil Status regis-
ters (and the assigned binary input of the SIPROTEC 4
device).
Function presets 1 or several Holding Registers.
Register Name
Coil Status
(0x references)
Input Status
(1X references)
Input Registers
(3X references)
Object Type
Double-point command,
Single-point command,
Double-point indication,
Single-point indication
Protection indication,
Device-status indication
Measurement values
SIPROTEC 4, Modbus TCP Profile, Manual
C53000-L1840-C582-1, Edition 07.2015
Broadcast
is
supported
no
no
no
no
yes
no
yes
yes