Installation manual

Series C Controller Configuration and Operation Manual
7-12  Athena Controls, Inc. 900M050U00
7.5.5 Specifying the Alarm Value (Setpoint)
How the alarm setpoint value is used depends on the type of alarm.
• process alarm – activated when process value reaches the value specified
with the output alarm setpoint parameter
• deviation alarm – activated when process value differs from the process
setpoint by the value specified with the output alarm setpoint parameter
• inverse band alarm – activated when the PV is inside a band centered
around the setpoint; the width of the band on either side of the setpoint is
specified with the output alarm setpoint parameter
• normal band alarm – activated when the PV is outside a band centered
around the setpoint; the width of the band on either side of the setpoint is
specified with the output alarm setpoint parameter
Parameter Name
: Output 1 Alarm Setpoint and Output 2 Alarm Setpoint
(See Note 2 below)
Name as Displayed
:
O1.SP O1.SP and O2.SPO2.SP
Used By:
1ZC and 16 C (16C, 18C, and 25C controllers support the alarm
parameters described in Section 9)
When Displayed:
if output type is alarm and output alarm action is not event
Range:
RTD and thermocouple input types: sensor low limit to sensor
high limit
linear input types: limited by the scaling defined for the input
using the SCL.LSCL.L and SCL.HSCL.H parameters in the InPInP (input) menu
(See Note 1 below.)
Default:
process alarm: 77
deviation, inverse band, normal band: 1728
Description:
Used to specify the alarm setpoint (process alarm), the alarm
limit (deviation alarm), or the width of the alarm band on either
side of the setpoint (inverse and normal band alarms)
Note 1: The range is reduced when a linear input is used and the value of the dSPLdSPL
(display) menu dEC.PdEC.P (decimal position) parameter is not 0 (zero). See 4.3.2 for more
information about the effect of a linear input on numerical ranges.
Note 2: The Athena Plus protocol code numbers used for these parameters depends on
the alarm operation as shown in the table.
If alarm operation is:
Output 1 alarm setpoint
code is:
Output 2 alarm setpoint
code is:
process alarm A0 B1
deviation alarm A1 B2
inverse band A1 B2
normal band A1 B2