Allen-Bradley Powermonitor 3000 User Manual page 76

4-16 Communications
Publication 1404-UM001D-EN-E - October 2004
The Powermonitor 3000 is a read/write data server. It does not initiate
data messages, but responds to messages from client devices. Its data
is organized in data tables similar to those found in a SLC 5/03
programmable controller.
Four primary methods to communicate with a Powermonitor 3000 are:
• Table Writes - A client may write a table of data to the
Powermonitor 3000. Only full data tables may be written. Data
writes may be performed to configure device features, set the
date and time, reset or preset energy counters, and select
records for subsequent reads.
• Simple Data Reads - A client may read metering or configuration
data. The client may read an entire data table or any number of
consecutive data elements up to the table boundary.
• Indexed Data Reads - The Powermonitor 3000 parses large data
structures such as logs, oscillograms, harmonics and transient
captures into data blocks, records and/or channels. These
records are transferred to an interface table. The client selects
the read-back mode and/or record, reads the interface table and
reassembles the original data structure.
• I/O Type Communications - The Powermonitor 3000 supports
polled, change-of-state and/or cyclical implicit I/O messaging,
depending on the communications options.
The specific communications setup depends on the communications
port type and protocol, whether serial, Ethernet, etc., as well as the
type of device controlling the communications. The following sections
will provide more detail.
Powermonitor 3000 Data Table Attributes
Powermonitor 3000 data table attributes include their addressing, data
access, number of elements, data type, and user-configurability.
Address - Data tables are addressed in a number of ways, depending
on the type of communications and the protocol being used.
• For serial communications (native RS-485 and optional RS-232)
and optional Ethernet CSP/PCCC communications, the CSP
(Client Server Protocol) File Number identifies the table (and its
data type) in message instructions, topic configuration or
communications commands.