Schweitzer Engineering Laboratories SEL-751 - Table C.10 Communications Processor DEMAND Region Map

C.11
Date Code 20170927 Instruction Manual SEL-751 Relay
SEL Communications Processors
SEL Communications Processor Example
SEL Communications
Processor to SEL-751
Unsolicited Write
Remote Analog
Example
From the perspective of the SEL-751, Remote Analogs (RA01 through RA32)
are specific, pre-allocated memory addresses. These memory addresses are
available to accept and store values from remote devices such as an SEL-2032,
SEL-2030, or SEL-2020 Communications Processor. Once these values from
the remote devices are written into the memory addresses in the SEL-751, you
can use these values similar to any other analog quantity in the SEL-751.
When using the SEL communications processor to send the Remote Analogs
to the SEL-751, we use the Unsolicited Write setting string and send the
information by using the SEL Fast Message protocol. This example shows
how to configure the Unsolicited Write message in the SEL communications
processor to move data stored in the USER region of Port 6 of the SEL
communications processor to an SEL-751 connected to Port 3 of the SEL
communications processor. We also show how to select the correct Remote Analog
data type in the SEL-751 to match the information in the Fast Message.
Although the SEL communications processor caters to static and dynamic
data, this example uses static data in the SEL communications processor
(entering the Unsolicited Write setting string is the same for static and
dynamic data; see the SEL communications processor manual for dynamic
data storing techniques). Assume the data are already stored in the USER
region of Port 6 in the SEL communications processor. The Unsolicited Write
message must be set in the Automatic messages on the SEL communications
processor port to which the SEL-751 is connected. Because the SEL-751 is
connected to Port 3 of the SEL communications processor, we use the
Unsolicited Write Automatic (MESG1) message setting of Port 3 to build the
Fast Message string, as shown in Figure C.5 (see the SEL communications
processor manual for in-depth discussions regarding the SEL communications
processor Automatic message settings).
Table C.10 Communications Processor DEMAND Region Map
Item Starting Address Ty p e
_YEAR 3000h int
DAY_OF_YEAR 3001h int
TIME(ms) 3002h int[2]
MONTH 3004h char
DATE 3005h char
YEAR 3006h char
HOUR 3007h char
MIN 3008h char
SECONDS 3009h char
MSEC 300Ah int
IAD(A) 300Bh float
IBD(A) 300Dh float
ICD(A) 300Fh float
IGD(A) 3011h float
3I2D(A) 3013h float