ProSoft Technology MVI46-MBP - Manual (Page 54)

MVI46-MBP ♦ SLC Platform Reference
Modbus Plus Communication Module
Page 54 of 101 ProSoft Technology, Inc.
February 19, 2008
Device Definition File
An entry must be made in the Device Definition File for each node on the network
that is to be addressed by the module's Master Command List. The entry in the
Device Definition File must consist of at least the Routing Path, including a valid
Data Slave Input path if the device is not a Modicon PLC
.
Master Command List
In order to function in the Master Mode, the module's Master Command List must
be defined. This list contains up to 200 individual entries, with each entry
containing the information required to construct a valid command. This includes
the following:
ƒ
Command enable mode (disabled, continuous or event control)
ƒ Node Route Path: From Device Definition File (index in Device Definition File)
ƒ Command Type: Read or Write up to 100 words per command
ƒ Source and Destination Register Address: Determines where data will be
placed and/or obtained
ƒ Count: Select the number of words to be transferred - 1 to 100
Event Command Control
Commands can be entered in the command list to operate either continuously or
under ladder logic control. The operating mode is selected when entering the
command in the Master Command List.
If a command is configured as an Event Command, the module looks to the
Event Command Control words received from the SLC processor to determine
when to execute set in the M1 file. The following table describes the structure of
the Control words:
Event Command Control
Database
Address Bit Offset for
Event Control
Name Description
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182 0 to 15
16 to 31
32 to 47
48 to 63
64 to 79
80 to 95
96 to 111
112 to 127
128 to 143
144 to 159
160 to 175
176 to 191
192 to 199 Event Commands #1 to 16
Event Commands #17 to 32
Event Commands #33 to 48
Event Commands #49 to 64
Event Commands #65 to 80
Event Commands #81 to 96
Event Commands #97 to 112
Event Commands #113 to 128
Event Commands #129 to 144
Event Commands #145 to 160
Event Commands #161 to 176
Event Commands #177 to 192
Event Commands #193 to 200 This block of data consists of 13
words of bits that are mapped to
individual commands in the
Master Command List.
Setting a bit will trigger the
corresponding command and will
set a one-shot bit for the
command in the module. This bit
must be reset before being set
again in order for the command to
execute again.
This data is transferred
continuously to the module in the
module's output image.
There is a one-to-one relationship between each bit in the table and a command
in the Master Command List based on the bit position in the table. The following
table shows this relationship: