Synchronized Demand - Siemens ACCESS 9340 Reference Manual

PMCM-9340D-0208
2/2008

Synchronized Demand

© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
The demand calculations can be synchronized by accepting an
external pulse input, a command sent over communications, or by
synchronizing to the internal real-time clock.
•
Input Synchronized Demand. You can set up the meter to
accept an input such as a demand synch pulse from an external
source. The meter then uses the same time interval as the other
meter for each demand calculation. You can use the standard
digital input installed on the meter to receive the synch pulse.
When setting up this type of demand, you select whether it will be
input-synchronized block or input-synchronized rolling block
demand. The rolling block demand requires that you choose a
subinterval.
•
Command Synchronized Demand. Using command
synchronized demand, you can synchronize the demand intervals
of multiple meters on a communications network. For example, if
a PLC input is monitoring a pulse at the end of a demand interval
on a utility revenue meter, you could program the PLC to issue a
command to multiple meters whenever the utility meter starts a
new demand interval. Each time the command is issued, the
demand readings of each meter are calculated for the same
interval. When setting up this type of demand, you select whether
it will be command-synchronized block or command-synchronized
rolling block demand. The rolling block demand requires that you
choose a subinterval. See Appendix B—Using the Command
Interface on page 203 for more information.
•
Clock Synchronized Demand . You can synchronize the
demand interval to the internal real-time clock in the meter. This
enables you to synchronize the demand to a particular time,
typically on the hour. The default time is 12:00 am. If you select
another time of day when the demand intervals are to be
synchronized, the time must be in minutes from midnight. For
example, to synchronize at 8:00 am, select 480 minutes. When
setting up this type of demand, you select whether it will be clock-
synchronized block or clock-synchronized rolling block demand.
The rolling block demand requires that you choose a subinterval.
ACCESS 9340 and 9360 Meters
Chapter 4—Metering Capabilities
EN–47