Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 113)

Publication 1785-UM012D-EN-P - July 2005
Communicating with a PLC-5 Adapter Channel 7-15
Example Bidirectional Repeating Block Transfer in
PLC-5/250 Supervisory Controller
Effects of Programming Block-Transfers to an Adapter-Mode
Controller Channel on Discrete Data Transfer
Because the discrete transfer configuration files are used for discrete data
transfer as well as block-transfer status exchanges between a supervisory
controller and adapter-mode controller channel, performing multiple
block-transfer to and from the adapter-mode controller channel impacts
discrete data transfer.
BTR
BLOCK TRANSFER READ
RACK
GROUP
MODULE
CONTROL BLOCK
002
0
0
BR020:0
DATA FILE
BT LENGTH
1BTD1:0
0
PLC-5 adapter-mode processor is configured for rack 2
CONTINUOUS N
BTW
BLOCK TRANSFER WRITE
RACK
GROUP
MODULE
CONTROL BLOCK
002
0
0
BW020:0
DATA FILE
BT LENGTH
1BTD2:0
0
CONTINUOUS N
BT TIMEOUT 3
BT TIMEOUT 3
FILE ARITH/LOGICAL
CONTROL
LENGTH
1R0:0
64
BTR Done Bit Data Not Valid Bit
BR020:0
DN
I:020
10
POSITION
MODE
0
ALL
DEST
EXPRESSION
#1N0:0
1BTD1:0
EN
DN
ER
EN
DN
ER
EN
DN
ER
FAL
BR020:0
EN
BWO20:0
EN
BR020:0
EN
BWO20:0
EN
Enter the following parameters in the
block-transfer instructions in the
supervisory processor.
Set the length to 0.
Use the remote I/O rack number for
which you configure the
adapter-mode processor.
Use the group and module numbers for
which the adapter-mode processor is
configured.
Condition the use of BTR data with a
"data valid" bit.
All address comments for contacts shown in
the following examples represent the set (1)
state of the bit in the PLC-5 processor.
Read data from adapter-mode processor
Send data to adapter-mode processor
Buffer read data from adapter-mode
processor to work area