Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual - Manual (Page 73)

Publication 1794-6.5.12 - September 2011
Program Your Module with PLC Family Processors 61
PLC-5 Family Processor
Block transfer instructions with the PLC-5 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 prompts you to create a control file when a block
transfer instruction is being programmed. A different block transfer control
file is used for the read and write instructions for your module.
13
U
IRT8 BTR
Error Bit
B17:0
EN
BTR
BLOCK TRANSFER READ
Rack
Group
Slot
Data File
3
2
1
N18:101
Length
Control
0
B17:0
EN
BTW
BLOCK TRANSFER WRITE
Rack
Group
Slot
Data
3
2
1
N18:1
DN
Length
Control
0
B17:0
5
B17:0
B17:0
15
ER
DN
ER
Rung M:0
The IRT8 module is located in rack 3, I/O group 2, slot 1. The control file is a 10 word
file starting at B17:0 that is shared by the BTR/BTW. The data obtained by the PLC3
processor is placed in memory starting at location N18:101, and with the default length
of 0, is 11 words long.
IRT8 BTR
Done Bit
IRT8 BTR/BTW
Control Block
The IRT8 module is located in rack 3, I/O group 2, slot 1. The control file is a 10 word
file starting at B17:0 that is shared by the BTR/BTW. The data sent by the PLC-3
processor to the IRT8 module is from PLC memory starting at N18:1, and with the default
length of 0, is 4 words long.
13
IRT8 BTR
Error Bit
B17:0
IRT8 BTW
Done Bit
IRT8 BTR/BTW
Control Block
3
B17:0
3
B17:0
U
IRT8 BTW
Error Bit
IRT8 BTW
Error Bit
PLC-3 Processor
Program Example
45566