Allen-Bradley 1404-M4, User Manual

Page: 274 / 356

Publication 1404-UM001D-EN-E - October 2004
C-20 Sample Applications
Word M0:1.2278
The instance number is the second word of the transaction body;
instance 14 is used to retrieve the real-time voltage, current, and
frequency metering information.
Word M0:1.229
The attribute number is the third word of the transaction body;
attribute 3 is used to get the metering information.
SLC 500 Sequencer Operation
This example uses a sequencer instruction and indirect addressing to
optimize program operation.
During initialization of Run mode, the sequencer input file is loaded
with the numbers corresponding to the two explicit message transfers
to be performed. Once Run mode has begun, the ladder program
remains in this mode.
Table 3.F
Instance
14
Table 3.G
Attribute
3
TIP
The speed at which the processor performs the
messages may be altered by resetting the On-Delay
timer that is located within the sequencer output
rung. However, the availability of new data values is
controlled by the Powermonitor 3000 table update
rate.