Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
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Appendix F MicroLogix 1400 Distributed Network Protocol
enabled, the controller enters a fault state (0x2A) when switching from
Program to Run mode.
When there is a change in configuration either from 6013…10000 event logs or
from 10000…6013 event logs in the last downloaded user program, a power
cycle is needed to apply the configuration, without which the controller enters
a fault state (0x2B) when switched to Run mode.
S:36/11 bit has to be set to one or zero in the user program prior to
downloading. This bit is read-only when the controller is in Program or Run
mode.
Control Generating Event
The controller checks all elements in the Object Data file for changes at the end
of a scan and generates events where needed.
The key method to turn on and off event generating by ladder logic is to assign
or un-assign the Class information bits in the Object Config Files.
The example below shows how to control the event generation condition by
ladder logic and implements Deadband for Analog Input Objects (which is only
necessary for MicroLogix 1400 Series A).
In this example, for 16-bit Analog Input point 0 (N11:0), if the absolute value of
the difference between the present value of N11:0 and the value that was most
recently queued as an event for that point exceeds the deadband value, then an
event is generated for that point.
Data File List
Name
Number
Type
Scope
Debug
Words
Elements
Last
Output
0
O
Global
No
18
6
O:5
Input
1
I
Global
No
24
8
I:7
Status
2
S
Global
No
0
66
S:65
Binary
3
B
Global
No
1
1
B3:0
Timer
4
T
Global
No
3
1
T4:0
Counter
5
C
Global
No
3
1
C5:0
Control
6
R
Global
No
3
1
R6:0
Integer
7
N
Global
No
1
1
N7:0
Float
8
F
Global
No
2
1
F8:0
16-bit Analog Input Object File
11
N
Global
No
10
10
N11:9
Binary Output Object File
12
B
Global
No
10
10
B12:0
16-bit Analog Input Config File
21
B
Global
No
10
10
B21:9
A16I OLD
30
N
Global
No
10
10
N30:9
A16I DEADB
31
N
Global
No
10
10
N31:9
A16I Temp
32
N
Global
No
10
10
N32:9
Summary of Contents for 1766-L32AWA
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