Ampcontrol IPM V2 - 12.4 Communications

Ampcontrol Pty Ltd – ABN 28 000 915 542
IPM V2 USER MANUAL
IPM2B003 Revision 15 – MAY/18
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 49 of 83
APPROVED FOR EXTERNAL DISTRIBUTION – PROPERTY OF AMPCONTROL PTY LTD – NOT TO BE REPRODUCED IN PART
RTM Off L
RTM Off Line – IPM cannot communicate with
RTM
Und. I Trp
Under Current trip caused outlet to stop
Stopped
IPM Stop Input Tripped Locally
Ext. Stop
IPM Stop Input Tripped Externally
12.4 Communications
The IPM Relay provides an industry standard RS485 Slave Modbus communication port. This allows
connection to a PLC or a SCADA system. APPENDIX 5: IPM Modbus Address Table provides detail on
Modbus addresses.
The baud rate is selected via the „Modbus:Baud /P‟ setting (Level 5, Screen 4) and is selectable between
1200 and 19200 Baud, with even, odd, or no parity. One stop bit is used in conjunction with parity, while
two stop bits are used with no parity.
The half-duplex 3-wire RS485 communications interface allows up to 31 devices to be multi-dropped
onto a single master communication line. The IPM‟s Modbus Slave address is selected via the „ModBus
Addr:‟ setting (Level 5, Screen 3) and is adjustable between 1 and 31.
12.4.1 Modbus Commands
The following Modbus commands are supported:
Table 5: Modbus Commands
Modbus CMD
Comment
03
Read Holding Registers
06
Store Single Register
Valid read registers are in the range from 1 to 96. An attempt to read a register outside this range will
result in an exception scan. Currently, only the first 78 registers contain valid data. Supported Modbus
exception responses are:
Table 6: Modbus Exception
Modbus Exception
Comment
01
Illegal Function
02
Illegal Data Address
03
Illegal Data Value