Allen-Bradley PLC-5 User Manual

Publication 1785-UM012D-EN-P - July 2005
13-10 Programming Considerations
4. Ensure that data does not change in the block-transfer data table output
file until the BTW is complete.
Using Special
Programming Routines
Use your design specification to determine if you need one or more of the
following special programming routines:
• power-up routines
• fault-driven routines (necessary to safely manage equipment faults)
• time-driven interrupt routines (selectable timed interrupts)
• event-driven interrupt routines (controller input interrupts)
The following table explains when to use these programming features.
/
OTU
BTW data valid
BTW data valid
BTW
Rack
Group
Module
Control Block
Data File
Length
Continuous
01
4
0
BT10:1
N11:0
6
N
BTW instruction must be
above this logic
any logic that
modifies the
BTW output file
data
BTW data valid
OTL)
[END OF FILE]
BT10:1
DN
EN
DN)
ER)
BT10:1
EN
BT10:1
EN
/
f
alse-to-true
t
ransition
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Allen-Bradley PLC-5 Specifications

General

Brand	Allen-Bradley
Model	PLC-5
Category	Controller
Language	English