7.13
Date Code 20120126
Instruction Manual
SEL-2032 Communications Processor
Settings
Automatic Message (SET A) Settings
Data
Collection Periods
You can set the SEL-2032 to collect data from attached devices on an
exception basis, i.e., only when an event occurs, and you can set the SEL-2032
to collect data on a regular, periodic basis. Each SEL-2032 port collects data
independently, based on your settings, and you can set each port to collect data
in different ways using separate message trigger conditions and data request
messages. Likewise, each SEL-2032 port responds to requests for data
independently, based on your settings. In either case, the SEL-2032 will not
issue or respond to another request for data on the same port until the previous
request has been satisfied. If the data response has not been completed before
the same message trigger condition occurs again, the second trigger will be
missed completely. The SEL-2032 acknowledges this missed trigger by
setting a delay bit in the port register, which is reported in the SEL-2032 status
report.
Although both exception and periodic data collection can encounter this type
of delay, you can control the periodic collection period, and thereby minimize
the possibility of collection delays and missed triggers. First, you should
consider if the attached device is capable of transferring data in binary format,
or only in ASCII character format, and second, the type of data you plan to
request, i.e., meter, target, demand, or another type.
presents some general guidelines regarding minimum data
collection periods you should use to collect various types of data from SEL
relays in binary or ASCII format. The guidelines in this table assume the relay
is using a baud rate of 2400 or above and is not busy processing events or
communicating on more than one port. As this table shows, there is a dramatic
difference between the minimum collection period for a relay that has Fast
Meter (binary data transfer) capability and one that can transfer data only in
ASCII format.
When connecting to SEL-100 and SEL-200 series relays that have Fast Meter
binary data capability, always connect to Port 2 on the relay. Binary data
transfer is not supported on Port 1 of these relays.
Collection periods for non-“20” message-based collections are dependent on
the device response speed and the value of the DELAY setting. As a
minimum, the collection period always contains the time required to send a
request and receive the response. If DELAY is set to ON, there is an additional
delay while the SEL-2032 waits for the port to be idle for 15 seconds on SEL
IED ports and 5 seconds on all other ports.
Table 7.2
SEL-2032 Minimum Data Collection Period (in Seconds)
Command
Binary Data Format
(Fast Meter)
ASCII Data Format
(no Fast Meter)
20METER
1
10
20DEMAND
1
10
20TARGET
1
20
a
a
SEL-321 Relay requires one minute.
20STATUS
N/A
10
20BREAKER
N/A
10
20HISTORY
N/A
20
b
b
SEL-321 Relay requires 30 seconds. The SEL-BFR and SEL-2BFR Relays require 40 seconds.
20EVENT
N/A
120
20EVENTS
N/A
120
20EVENTL
c
c
Only supported on SEL relays that support 16 sample/cycle event reports.
N/A
300
Summary of Contents for SEL-2032
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