Schweitzer Engineering Laboratories SEL-751 - Table 7.9 ANALOG Command

7.23
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
When parameter p is a percentage, the relay displays the following message
during the test:
When parameter p is a ramp function, the device displays the following
message during the 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:
Example 1. The following is an example of the device response to the ANA
command in the percentage mode. For this example, assume that the analog
output signal type is 4–20 mA, and that you 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:
Table 7.9 ANALOG Command
Command Description Access Level
ANA c p t Temporarily assigns a value to an analog output
channel.
2
Parameters
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.
Outputting xx.xx [units] to Analog Output Port for y.y minutes. Press any key to end
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
Ramping Analog Output at xx.xx [units]/min; full scale in y.y minutes. Press any key
to end test
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
Analog Output Port Test Complete
NOTE: 0% = low span, 100% = high
span. For scaled output from 4–20 mA,
0 percent is 4 mA and 100 percent is
20 mA.
Output 20.00 mA 4.00 mA–
75
100
---------
 4.00 mA+ 16.00 mA==