7.15
Date Code 20081022 Instruction Manual SEL-787 Relay
Communications
SEL ASCII Protocol and Commands
Entering any character (including pressing the space key) ends the command
before reaching the specified interval completion. You can test the analog
output in one of the following two modes:
➤ Fixed percentage: Outputs a fixed percentage of the signal for a
specified duration
➤ Ramp: Ramps the output from minimum to maximum of full
scale over the time specified
NOTE: 0% = low span, 100% = high
span. For a scaled output from
4–20 mA, 0 percent is 4 mA and
100 percent is 20 mA.
When parameter p is a percentage, the relay displays the following message
during the test:
Outputting xx.xx [units] to Analog Output Port for y.y
minutes. Press any key to end test
When parameter p is a ramp function, the device displays the following
message during the test:
Ramping Analog Output at xx.xx [units]/min; full scale in
y.y minutes. Press any key to end test
For either mode of operation (percentage or ramp), when the time expires, or
upon pressing a key, the analog output port returns to normal operation and the
device displays the following message:
Analog Output Port Test Complete
Table 7.7 ANALOG Command
Command Description Access Level
ANA c p t Temporarily assigns a value to an analog output channel. 2
Table 7.8 ANALOG Command Format
Parameter Description
c Parameter c is the analog channel (either the channel name, e.g., A0301, or
the channel number, e.g., 301).
p Parameter p is a percentage of full scale, or either the letter “R” or “r” to
indicate ramp mode.
t Parameter t is the duration (in decimal minutes) of the test.
where:
xx.xx
is the calculation of percent of full scale
[units]
is either mA or V, depending on the channel type setting
y.y
is the time in minutes
where:
xx.xx
is the calculation based upon range/time t
[units]
is either mA or V, depending on the channel type setting
y.y
is the time in minutes
To Next Page
Loading...
