Example: Configuring an Alarm on a Digital Input
Assume that you want to generate an alarm when a binary pattern of
“1000” is read on the upper four bits of port 1. Send the following
commands to configure the port for an alarm.
CALC:COMP:TYPE EQUAL,(
@301)
CALC:COMP:DATA 128,(
@301)
CALC:COMP:MASK 240,(
@301)
OUTPUT:ALARM2:SOURCE (
@301)
CALC:COMP:STATE ON,(
@301)
Here are the calculations used to evaluate the alarm (assume that a
decimal 146 was read from the port):
Bit 7 Bit 0
10010010 Data read from port (decimal 146)
10000000 CALC:COMP:DATA command (decimal 128)
00010010 “X-OR” result
11110000 CALC:COMP:MASK command (decimal 240)
00010000 “AND” result (no alarm generated)
Since the calculations produce a non-zero result (decimal 16),
an alarm is not generated in this example.
• Remote Interface Operation (Totalizer Channel): To assign the alarm
number to report any alarm conditions on the specified totalizer
channels, use the following command.
OUTPut:ALARm[1|2|3|4]:SOURce (
@<ch_list>)
To configure an alarm on a totalizer channel, specify the desired
count as the upper limit using the following command.
CALCulate:LIMit:UPPer <
count>[,(@<ch_list>)]
To enable the upper limit on the specified totalizer channel, use the
following command.
CALCulate:LIMit:UPPer:STATe ON [,(
@<ch_list>)]
ABX-OR
0
0
1
1
0
1
0
1
0
1
1
0
ABAND
0
0
1
1
0
1
0
1
0
0
0
1
Chapter 4 Features and Functions
Alarm Limits
132
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