ProSoft Technology MVI69E-MBS - Manual (Page 60)

MVI69E-MBS Configuration MVI69E-MBS ♦ CompactLogix Platform
User Manual Communication Module
Page 60 of 162 ProSoft Technology, Inc.
January 6, 2014
Word Swap (1)= The words are swapped (ABCD= CDAB)
Word and Byte Swap (2) = The words are swapped, then
the bytes in each word are swapped (ABCD=DCBA)
Byte Swap (3) = The bytes in each word are swapped
(ABCD=BADC)
Note: Each pair of characters is a byte. Ex: AB and CD.
Two pairs of characters is 16-bit register Ex: ABCD.
Node Address 1 to 255
(0 = broadcast)
Specifies the Modbus slave node address on the network to
be considered. Most Modbus devices only accept an
address in the range of 1 to 247. If the value is set to zero,
the command is a broadcast message on the network. The
Modbus protocol permits broadcast commands for write
operations. Do not use this node address for read
operations.
Modbus
Function 1,2,3,4,5,6,15,16 Specifies the Modbus function to be executed by the
command. These function codes are defined in the Modbus
protocol.
1 – Read Coil Status (0xxxx)
2 – Read Input Status (1xxxx)
3 – Read Holding Registers (4xxxx)
4 – Read Input Registers (3xxxx)
5 – Force (Write Single) Coil (0xxxx)
6 – Force (Write Single) Holding Register (4xxxx)
15 – Preset (Write) Multiple Coils (0xxxx)
16 – Preset (Write) Multiple Registers (4xxxx)
MB Address in
Device 0 to 9999 Specifies the register or digital point address offset within
the Modbus slave device. The MBS Master reads or writes
from/to this address within the slave.
Refer to the documentation of each Modbus slave device for
their register and digital point address assignments.
Note: The value entered here does not need to include the
“Modbus Prefix” addressing scheme. Also, this value is an
offset of the zero-based Modbus addressing scheme.
Example: Using a Modbus Function Code 3 to read from
address 40010 in the slave, a value of ‘9’ would be entered
in this parameter.
The firmware (internally) adds a ‘40001’
offset to the value entered. This is the same for all Modbus
addresses (0x, 1x, 3x, 4x).
Override Value
Upon Error
This parameter is only applicable for Enable Codes 3
(Bit/Word Override) or 4 (Float Override).
If an error occurs associated to a read command the module
automatically populates the associated database area with
this override value.