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10-5
Setpoints/Alarms
10
Figure 10-5. Low Deviation for both Active Above and Active Below
Figure 10-6. Band Deviation for both Active Above and Active Below
10.5 SELECTING “AL CNF” ALARM CONFIGURATION FEATURES
These bits offer the same selections for “SP 3” and “SP 4” as “SP CNF” did
for “SP 1” and “SP 2”, except for the last bit, which controls “SP 3” and
“SP 4” LATCH reset.
1. “ALC.1=0” makes Alarm 1 (Setpoint 3) active above the
Setpoint value.
“ALC.1=1” makes Alarm 1 (Setpoint 3) active below the
Setpoint value.
When Alarm 1 (Setpoint 3) is assigned to place a band about the Setpoint 1
level (by setting “ALF.1=3”, described in Section 10.6), “ALC.1=0” makes
Alarm 1 (Setpoint 3) active ABOVE and BELOW the band (OUTSIDE the
band), with the chosen hysteresis for Alarm 1 (Setpoint 3) now inside the
band. If “ALC.1=1”, Alarm 1 (Setpoint 3) is active INSIDE the band, with the
chosen hysteresis for Alarm 1 (Setpoint 3) now outside the band.
OFF SIGNAL
LEVEL
ACTIVE ABOVE
SP3 = 100
SP1–SP3–HYS = 40
SP1–SP3 = 50
ON OFF ON ON
SP1–SP3+HYS = 60
SP1+SP3–HYS = 240
SP1+SP3 = 250
SP1+SP3+HYS = 260
OFF
ACTIVE BELOW
OFF ON ON OFF
ON OFF OFF SIGNAL
LEVEL
ON OFF ON SIGNAL
LEVEL
ACTIVE BELOW ACTIVE ABOVE
SP3 = 100
SP1–SP3–HYS = 40
SP1–SP3 = 50 SP1–SP3 = 50
SP1–SP3+HYS = 60