Watlow Series 988 Family - Manual (Page 46)

Data Communications with the Watlow Series 988 Family
Temperature/process Controller Prompt Table
986, 987,
988
, 989
Name Description Read (?) and/or Write (=) Syntax Range
data.1 data.2
Modbus
address
6.2 Command Summary Series 986-989, Chapter 6
Table 6.2 -
A2HI to ALM
ç
CAUTION:
Avoid writing <=>
continuously, such
as ramping set
points or repetitive
loops, to the
Series 986-989
EEPROM memory.
Continuous writes
may result in
premature control
failure, system
downtime and
damage to
processes and
equipment.
NOTE:
The number of
decimal places
returned by many
of these
commands is
determined by the
DEC1, DEC2, IN1
or IN2 setting.
(This does not
apply to Modbus
Protocol.)
A2HI Output 2 Alarm High ? A2HI Process: A2LO to sensor high range
14 = A2HI data.2 Deviation: 0 to 9999
°
Rate: 0 to 9999
°
/minute
Default: RH, 999
°
, or 999
°
/min.
A2LO Output 2 Alarm Low ? A2LO Process: sensor low range to A2HI
13 = A2LO data.2 Deviation: -999 to 0
°
Rate: -9999 to 0 ° /minute
Default: RL, -999 ° , or -999 ° /min.
A3HI Output 3 Alarm High ? A3HI Process: A3LO to sensor high range
16 = A3HI data.2 Deviation: 0 to 9999
°
Rate: 0 to 9999
°
/minute
Default: RH, 999
°
, or 999
°
/min.
A3LO Output 3 Alarm Low ? A3LO Process: sensor low range to A3HI
15 = A3LO data.2 Deviation: -999 to 0 °
Rate: -999 to 0 ° /minute
Default: RL, -999 ° , or -999 ° /min.
ACAL Analog Offset ? ACAL -999 to 999
°
F
94 = ACAL data.2 -555 to 555
°
C
-999 to 999 units
Default: 0
°
F, 0
°
C, 0 units
AL2 Alarm 2 Type ? AL2 0 = Deviation Alarm, Input 2
74 = AL2 data.2 1 = Process Alarm, Input 2
2 = Process Alarm, Input 1
3 = Deviation Alarm, Input 1
4 = Rate Alarm, Input 1
Default: 2
AL3 Alarm 3 Type ? AL3 0 = Deviation Alarm, Input 2
79 = AL3 data.2 1 = Process Alarm, Input 2
2 = Process Alarm, Input 1
3 = Deviation Alarm, Input 1
4 = Rate Alarm, Input 1
Default: 2
ALGO Algorithm ? ALGO 0 = two sets of PID prompts [Pid2]
100 = ALGO data.2 1 = one set of PID prompts [Pid]
2 = prop/derivative w/manual reset [Pdr]
3 = 1 process output both heat or cool [dUPL]
Default: 1
ALM Alarm Status ? ALM 0 = No alarms occurring (0000 0000)
3 (Writing a 0 clears = ALM 0 Bit 1 = A2LO (0000 0001)
next alarm.) Bit 2 = A2HI (0000 0010)
Bit 3 = A3LO (0000 0100)
Bit 4 = A3HI (0000 1000)