Rockwell Automation 150 USE MN/SMC DIALOG + CONTROLLER - Manual (Page 122)

Serial Communications 8-13
BT Control Buffer Layout – The following table maps integer files
starting at N10:0 with the associated M0 file location as defined in the
sample ladder logic program that follows.
BT Control Datafile
① BT logical address format: logical rack/group/slot (slot is always “0” for the 1203-GD1)
Logical address examples Logical Rack 0, Group 0, Slot 0 = 0
Logical Rack 2, Group 4, Slot 0 = 240
② This word is set by the ladder logic program. Refer to the 1747-SN scanner manual for Control Flag
Definitions.
BTW Datafile Format – A four-word data file is required to
accomplish a “Continuous Parameter Value Read.” For the example
that follows, the BTW Datafile will begin at address N10:10.
BTW Datafile
① This is a fixed value, associated with the “Continuous Parameter Value Read” function.
Data Path for the BTW – Rung 2:6 of the sample ladder logic
program that follows executes a COP instruction to the M0 file to load
the necessary data for the BTW.
Address 0 1 2 3 4 5 6 7 8 9
N10:0 ② 64 0
Address 0 1 2 3 4 5 6 7 8 9
N10:10 4 1 ① 11 1
Address 0 1 2 3 4 5 6 7 8 9 Address 0 1 2 3 4 5 6 7 8 9
N10:0 £ M0:1.100
N10:10 £ M0:1.110
N10:20
£
M0:1.120
N10:30 £ M0:1.130
N10:40
£
M0:1.140
N10:50 £ M0:1.150
N10:60
£
M0:1.160
N10:70
£
M0:1.170
Control Flags
BT Length
BT Logical Address①
Message Length
PLC Decimal Value
Number of Parameter Values to Read
Starting Parameter Number