ProSoft Technology MVI69-MCM - Manual (Page 105)

MVI69-MCM ♦ CompactLogix or MicroLogix Platform Reference
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 105 of 167
March 22, 2011
5.1.4 Functional Specifications
Modbus Master
A port configured as a virtual Modbus Master actively issues Modbus commands
to other nodes on the Modbus network, supporting up to 100 commands on each
port. The Master ports have an optimized polling characteristic that polls slaves
with communication problems less frequently.
Command List Up to 100 command per Master port, each fully
configurable for function, slave address, register to/from
addressing and word/bit count.
Polling of command list Configurable polling of command list, including continuous
and on change of data, and dynamically user or automatic
enabled.
Status Data Error codes available on an individual command basis. In
addition, a slave status list is maintained per active
Modbus Master port.
Modbus Slave
A port configured as a Modbus slave permits a remote Master to interact with all
data contained in the module. This data can be derived from other Modbus slave
devices on the network, through a Master port, or from the CompactLogix or
MicroLogix processor.
Node address 1 to 247 (software selectable)
Status Data Error codes, counters and port status available per
configured slave port