12 SCADA Communications
P50 Agile P15D
12-4
P15D/EN TM/B
2
SCADA COMMUNICATIONS
2.1
Modbus
This section describes how the MODBUS standard is applied to the Px50 platform. It is not a
description of the standard itself. The level at which this section is written assumes that the reader is
already familiar with the MODBUS standard.
The MODBUS protocol is a master/slave protocol, defined and administered by the MODBUS
Organization. For further information on MODBUS and the protocol specifications please see the
Modbus web site (www.modbus.org).
2.1.1
Overview
Physical Connection and Link Layer
Only one option is available for connecting MODBUS.
•
Rear serial port 1 - for permanent SCADA connection via EIA(RS)485
The MODBUS interface uses ‘RTU’ mode communication rather than ‘ASCII’ mode as this provides
more efficient use of the communication bandwidth. This mode of communication is defined by the
MODBUS standard.
The IED address and baud rate can be selected using the front panel menu or with P50 Agile
configurator.
When using a serial interface, the data format is: 1 starts bit, 8 data bits, 1 parity bit with 1 stop bit, or
2 stop bits (a total of 11 bits per character). One stop bit when parity even or odd, 2 stop bits when
parity none.
MODBUS Functions
2.1.2
Protocol Mapping
The following MODBUS function codes are supported:
Code
Function Name
Addresses starts with
02
Read Input Status
1x addresses
03
Read Holding Registers
4x addresses
04
Read Input Registers
3x addresses
05
Force Single Coil
0x addresses
16
Preset Multiple Registers
4x addresses
•
Exception Codes generated in case of an error:
Code
MODBUS Response Name
Product interpretation
01
Illegal Function Code
The function code received in query is not supported by the IED.
02
Illegal Data Address
The start address received in the query is not an allowable value.
NOTE:
If the start address received is correct but the range includes
unsupported address, then this error is produced.
•
The addresses of the MODBUS registers start from 1 and the user may have to subtract 1 from
the addresses, depending on the configuration of the Master station configuration.
Содержание MiCOM P50 Agile P15D
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