Publication 1794-6.5.8 - January 2010
34 Module Programming
Figure 1.1
PLC-3 Family Sample Program Structure for a 1794-IF4I Module
Figure 1.2
PLC-3 Family Sample Program Structure for a 1794-OF4I Module
EN
BTR
BLOCK XFER READ
RACK:
GROUP:
MODULE:
CONTROL:
02
1
0
#B3:0
DATA FILE:
LENGTH:
#B4:0
7
EN
BTW
BLOCK XFER WRITE
RACK:
GROUP:
MODULE:
CONTROL:
02
1
0
#B3:0
DN
DATA FILE:
LENGTH:
#B5:0
5
B3:0
05
Block Transfer
Read Done Bit
ER
Enable
Done
Error
12
15
13
Enable
Done
Error
02
05
03
Block Transfer
W
rite Done Bit
1
2
DN
ER
B3:0
15
Program
Action
At power-up in RUN mode, or when the
processor is switched from PROG to RUN,
the user program enables a block transfer
read.
Thereafter, the program continuously
performs read block transfers.
Note: You must create the data file
for the block transfers before you
enter the block transfer instructions.
B4:5
15
Power-up Bit
B4:5
14
B4:5
15
B4:5
13
Power-up Bit
FP Bit
CF Bit
B5:4
15
IC Bit
3
Then it initiates a block transfer write to
configure the module if the power--up bit
is set.
This rung toggles the Initate Configuration
bit from 0 to 1 to 0
L
B5:4
14
EN
BTR
BLOCK XFER READ
RACK:
GROUP:
MODULE:
CONTROL:
02
0
0
#B6:0
DATA FILE:
LENGTH:
#B7:0
6
EN
BTW
BLOCK XFER WRITE
RACK:
GROUP:
MODULE:
CONTROL:
02
0
0
#B6:0
DN
DATA FILE:
LENGTH:
#B8:0
7
B6:0
05
Block Transfer
Read Done Bit
ER
Enable
Done
Error
12
15
13
Enable
Done
Error
02
05
03
Block Transfer
W
rite Done Bit
1
DN
ER
B6:0
15
Program
Action
At power-up in RUN mode, or when the
processor is switched from PROG to RUN,
the user program enables a block transfer
read.
Thereafter, the program continuously
performs read block transfers and write
block transfers.
Note: You must create the data file
for the block transfers before you
enter the block transfer instructions.
3
2
B7:4
14
B7:4
15
B7:4
13
Power-up Bit
FP Bit
CF Bit
B8:6
15
IC Bit
This rung toggles the Initate Configuration
bit from 0 to 1 to 0
Then it initiates a block transfer write to
configure the module and send data
values.
L
B8:6
14
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