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Chapter 5 – Programming
Group 51 Modbus Plus
This group name identifies which communication hardware module is con-
nected to the ACS 600 drive. Some option modules support multiple proto-
cols, which can be selected with a parameter.
The setup parameters can be modified either by using the control panel, or by
CMT PC software. These parameters are described below.
51.1 MODULE TYPE
Shows the connected communication option module type and version. For
Modbus Plus communication this is NMBP-01.
51.2 PROTOCOL
Shows the logical protocol on the hardware communication option module.
For Modbus Plus module, there are two selections.
MODBUS PLUS
This is the Modbus Plus protocol option, with diagnostic counter updates
(Parameters 51.4 and 51.5).
MBP FAST
This is Modbus Plus protocol, without diagnostic counter updates (Parameters
51.4 and 51.5). In this mode, these diagnostic counters remain in their last
value.
51.3 Station
Sets the node number for the module on Modbus Plus network.
1 – 64
51.4 Good Msg
This diagnostics counter increases by one every time a valid Modbus Plus
message has been received by the NMBP-01 Module. This counter will roll
over from 32767 back to 0. During normal operation, this counter is increas-
ing constantly. Valid messages are message numbers 0x03, 0x06, and 0x10,
with read and write addresses within groups.
0 – 32767
51.5 Bad Msg
This diagnostics counter increases by one every time the NMBP-01 Module
finds any kind of communication error. This counter will roll over from 32767
back to 0. During normal operation, this counter hardly ever increases. Com-
munication errors are increased by one whenever the NMBP-01 Module
receives an unsupported command, or a parameter read or write to addresses
outside parameter group ranges.
0 – 32767
Installation and Start-up Guide for NMBP-01
5-3
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