Allen-Bradley 1404-M4, User Manual

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Publication 1404-UM001D-EN-E - October 2004
Sample Applications C-21
Data Files Used
The reset word for the sequencer is N10:0. The first word in the
rotation of the sequencer is N10:1. The value in N10:0 must be the
same as that in N10:1. The size of file N10 is equal to the size of the
largest sequencer input file. This size depends on the number of
explicit message transfers to be performed. The sequencer length may
be expanded or reduced for run mode. It is imperative that the
corresponding file that serves as the source of the sequencer’s input
file, N10, must be modified accordingly.
File Data Values
Prior to running the sample ladder, the sequencer initialization file
needs to be loaded with the numbers that correspond to the explicit
message transfer sequence. The following is a list of each mode’s
initialization file and the required/possible numbers to be stored in
Table C.8 Data Files
Data File
Address Number of
Elements Description
N9 1 N9:0 Sequencer Output
N10 Variable N10:0 Sequencer Input
R6:0 Sequencer Control
Message Read Data Table Locations
(Control/Data)
N20 / F30 14 Voltage/Current Data
N21 / F31 13 Real-Time Power
N22 / F32 13 Power Factor
N23 / N33 23 KWh and KVAh
N24 / N34 23 KVarh
N25 / F35 10 Demand
N26 / N36 27 Diagnostic
IMPORTANT
Failure to modify the length of file N10 for a
modification of either the Configuration or Run
sequence results in improper operation of the ladder
program, and possible FAULT of the processor due to
invalid indirect offsets.
Allen-Bradley HMIs