Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual - Manual (Page 74)

Publication 1794-6.5.12 - September 2011
62 Program Your Module with PLC Family Processors
PLC-5/250 Family Processor
Block transfer instructions with the PLC-5/250 processor use a control file
and a data file. The block transfer control file contains the data table section
for module location, the address of the block transfer data file and other
related data. The block transfer data file stores data that you want transferred
to the module (when programming a BTW) or from the module (when
programming a BTR).
The programming terminal automatically selects the control file based on rack,
group and module, and whether it is a read or write. A different block transfer
control file is used for the read and write instructions for your module. A
different block transfer control file is required for every module.
EN
BTR
BLOCK TRANSFER READ
Rack
Group
Slot
Control
02
2
1
N22:200
DN
Data File
Length
Continuous N22:101
0
N
ER
EN BLOCK TRANSFER WRITE
Rack
Group
Slot
Control
02
2
1
N22:205
DN
Data File
Length
Continuous N22:1
0
N
ER
N22:200
15
N22:200
15
N22:205
15
Rung 2:0
The IRT8 module is located in rack 2, I/O group 2, slot 1. The integer control file
starts at N22:200, is 5 words long and is compatible with all PLC-5 family members.
The data obtained by the PLC-5 processor from the IRT8 module is placed in memory
starting at N22:101, and with the default length of 0, is 11 words long. The length can
be any number
N22:205
15
Rung 2:1
The IRT8 module is located in rack 2, group 2, slot 1. The integer control file starts
at N22:205, is a 5 words long and is compatible will all PLC-5 family members. The data
sent by the PLC-5 processor to the IRT8 module starts at N22:1, and with the default
length of 0, is 4 words long. Valid BTW lengths: 0, 1, 2, 3, and 4. In enhanced PLC-5
processors
1
, the block transfer data type may be used as a control file.
IRT8 BTR
Enable Bit
IRT8 BTW
Enable Bit
IRT8 BTR
Control File
IRT8 BTR
Enable Bit
IRT8 BTW
Enable Bit
IRT8 BTW
Control File
PLC-5 Processor
Program Example
BTW
À
Enhanced PLC-5 processors include: PLC-5/11, -5/20, -5/3x, -5/4x, and -5/6x.
45567