ProSoft Technology MVI46-MCM - Manual (Page 59)

MVI46-MCM ♦ SLC Platform Reference
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 59 of 108
March 29, 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 SLC processor.
Node address 1 to 247 (software selectable)
Status Data Error codes, counters and port status available per configured slave
port