Schweitzer Engineering Laboratories SEL-787, Instruction Manual, Page: 296 / 564

7.16
SEL-787 Relay Instruction Manual Date Code 20081022
Communications
SEL ASCII Protocol and Commands
Example 1
The following is an example of the device response to the ANA command in
the percentage mode. For this example, we assume the analog output signal
type is 4–20 mA, and we want to test the analog output at 75 percent of rating
for 5.5 minutes. To check the device output, calculate the expected mA output
as follows:
To start the test, enter ANA A0301 75 5.5 at the Access Level 2 prompt:
=>>
ANA A0301 75 5.5 <Enter>
Outputting 16.00 mA to Analog Output Port for 5.5 minutes.
Press any key to end test
Example 2
The following is an example of the ramp mode when the analog output signal
type is 4–20 mA for a 9.0 minute test. To check the device output, calculate
the current/time (mA/min) output as follows:
To start the test, enter ANA AO301 R 9.0 at the Access Level 2 prompt:
=>>
ANA AO301 R 9.0 <Enter>
Ramping Analog Output at 1.78 mA/min; full scale in 9.0 minutes.
Press any key to end test
CEV Command
The SEL-787 provides Compressed ASCII event reports to facilitate event
report storage and display. SEL communications processors and the SEL-5601
Analytic Assistant software take advantage of the Compressed ASCII format.
Use the
CHIS command to display Compressed ASCII event history
information. Use the CSUM command to display Compressed ASCII event
summary information. Use the CEVENT ( CEV ) command to display
Compressed ASCII event reports. See Table C.2 for further information.
Compressed ASCII Event Reports contain all of the Relay Word bits. CEV R
command gives the raw Compressed ASCII event report.
CLOSE n Command (Close Breaker n, where n = 1 or 2)
The CLO n (CLOSE n ) command asserts Relay Word bit CC n for 1/4 cycle
when it is executed. Relay Word bit CC n can then be programmed into the
CL n SEL
OGIC
control equation to assert the CLOSE n Relay Word bit, which
in turn asserts an output contact (e.g., OUT102 = CLOSE1) to close circuit
breaker
n (see Table 4.24 and Figure 4.45 for factory default settings CL1 and
CL2 and close logic).
To issue the CLO 1 command, enter the following.
=>>
CLO 1 <Enter>
Close Breaker1 (Y,N)?
Y <Enter>
=>>
Typing N <Enter> after the above prompt will abort the command.
Output 20.00 mA 4.00 mA –
( )
75
100
---------
•
4.00 mA + 16.00 mA = =
Output
20.00 mA 4.00 mA –
9.0 min
---------------------------------------------------
1.78 mA/min = =