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MVI56E-MCMR ♦ ControlLogix Platform
Reference
Modbus Communication Module with Reduced Data Block
User Manual
ProSoft Technology, Inc.
Page 163 of 223
Block Response from Module to Processor
Word Offset
Data Field(s)
Description
0
Number of Slaves
to report
This field always receives a value of 248 (-8 as a
signed SINT, 16#F8). A status word for all potential
Modbus Slave Device Addresses will be included in
the returned data.
1
Start index of first
Slave
This field is always 0. All 248 potential Modbus Slave
Device Addresses will have a corresponding Status
Word in the returned data.
2 to 39
Slave Status List
data
0
The Slave is inactive, not currently the slave
being actively polled, waiting for its turn to be
polled, or not a Modbus Slave Device Address
used in the
Command List
for the Master port.
1
The Slave at this specific address is the one
currently being polled or controlled by the
Master port. This does not indicate that the
Slave has responded to a poll request; only
that the Master is currently trying to poll this
Slave.
2
The may be thought of as a "Slow Poll" mode,
whereby a Slave with communications errors
will be polled at a lower-than-normal
frequency. This status is set by the Master
port whenever it has failed to communicate
with the Slave device and the Port
configuration parameter,
E
RROR
D
ELAY
C
OUNTER
, has been set greater than 0.
The following illustration shows the MSG instruction configuration for a block of
this type.