Computer Operations
Computer Interface Commands and Operation
4
4-27Table 4-5. Command and Query Reference (cont)
ALARM_ASSOC Associate Alarm Output
Configures alarm output associations at the rear panel DIGITAL I/O
connector for channels 4 to 20.
ALARM_ASSOC <channel>,<limit_num>,<DO_line>
<channel> = (4 .. 20)
<limit_num> = 1 or 2
<DO_line> = (0 .. 7)
This command is used to associate a channel alarm for channels 4 to 20
with a rear panel DIGITAL I/O line (I/O 0 to I/O 7). Alarm conditions are
asserted with a logical low (nominal =0.7V DC); non-alarm conditions are
indicated by a logical high (nominal =5.0V DC). The default setting for 4 to
20 are ORed to the I/O lines in groups, as shown below.
I/O 4 I/O 5 I/O 6 I/O 7
Chan Chan Chan Chan
4 567
8 9 10 11
12 13 14 15
16 17 18 19
20
For example, if channel 6 or 10 0r 14 0r 18 goes into alarm (either Limit 1
or Limit 2), I/O 6 is asserted. This command changes the default settings
or any other settings, as desired. Any number of channel alarm limits can
be assigned to the same I/O line. For example, all alarms on all channels 4
to 20 could assert a single I/O line. Alarm associations can be returned to
the default settings with an *RST configuration reset command. DIGITAL
I/O lines set logic low remain low unless values have been cleared by a
new alarm association, REVIEW_CLR, or by changing any parameter on
any channel. If this command is entered during scanning while logging to
the memory card, an Execution Error is generated.
Example: ALARM_ASSOC 10,1,2 [For channel 10, alarm Limit 1, assert
DIGITAL I/O line 2].