Name
Description
Read (?) and/or Write (=) Syntax
Range
data.1
data.2
Modbus
Address
996, 997,
998
, 999
Dual Channel Controller Prompt Table
Command Summary Series 996-999, Chapter 7
7.7
Data Communications with the Watlow Series 988 Family
IT1A
Integral for Output 1 ? <sp> IT1A <cr>
0.00 to 99.99 minutes per repeat
501
PID Channel A
= <sp> IT1A <sp> data.2 <cr>
Default: 0.00 minutes per repeat
IT1B
Integral for Output 1 ? <sp> IT1B <cr>
0.00 to 99.99 minutes per repeat
521
PID Channel B
= <sp> IT1B <sp> data.2 <cr>
Default: 0.00 minutes per repeat
IT2A
Integral for Output 2 ? <sp> IT2A <cr>
0.00 to 99.99 minutes per repeat
511
PID Channel A
= <sp> IT2A <sp> data.2 <cr>
Default: 0.00 minutes per repeat
IT2B
Integral for Output 2 ? <sp> IT2B <cr>
0.00 to 99.99 minutes per repeat
531
PID Channel B
= <sp> IT2B <sp> data.2 <cr>
Default: 0.00 minutes per repeat
ITY1
Input 1
? <sp> ITY1 <cr>
0 = None
8
Hardware Type
1 = t/c only
4 = Input off
5 = Universal RTD
6 = Universal high gain t/c
7 = Universal low gain t/c
8 = Universal millivolts
9 = Universal process
ITY2
Input 2
? <sp> ITY2 <cr>
0 = None
9
Hardware Type
1 = t/c only
4 = Input off
5 = Universal RTD
6 = Universal high gain t/c
7 = Universal low gain t/c
8 = Universal millivolts
9 = Universal process
LAT3
Alarm 3 Latching
? <sp> LAT3 <cr>
0 = Latching alarms
738
= <sp> LAT3 <sp> data.2 <cr>
1 = Non-latching alarms
Default: 1
LIN2
Linearization
? <sp> LIN2 <cr>
0 = None
618
Process Input 2
= <sp> LIN2 <sp> data.2 <cr>
1 = Wet bulb
2 = Vaisala HMM-30C
3 = Rotronic H260
Default: 0
LOC
Keyboard Lockout
? <sp> LOC <cr>
0 = No lockout
1300
= <sp> LOC <sp> data.2 <cr>
1 = Lock out mode key
2 = Lock out mode & auto/man keys
3 = Lock out all single keys
Default: 0
MDL
Model Number
? <sp> MDL <cr>
998 (996 - 999 dual channel unit)
0
MOD
Mode Key Action
= <sp> MOD <sp> 1 <cr>
0 = Mode to previous prompt
1900
1 = Mode to next prompt
OT1A
Output 1 Channel A
? <sp> OT1A <cr>
0 = Heat
700
Action
= <sp> OT1A <sp> data.2 <cr>
1 = Cool
2 = None
OT1B
Output 1 Channel B
? <sp> OT1B <cr>
0 = Heat
717
Action
= <sp> OT1B <sp> data.2 <cr>
1 = Cool
2 = None
OT2A
Output 2 Channel A
? <sp> OT2A <cr>
0 = Heat
716
Action
= <sp> OT2A <sp> data.2 <cr>
1 = Cool
2 = None
OT2B
Output 2 Channel B
? <sp> OT2B <cr>
0 = Heat
733
Action
= <sp> OT2B <sp> data.2 <cr>
1 = Cool
2 = None
OT3
Output 3 Action
? <sp> OT3 <cr>
0 = None
734
= <sp> OT3 <sp> data.2 <cr>
1 = Alarm 3
2 = Alarm 3 reverse acting
ç
CAUTION:
Avoid writing <=>
continuously,
such as ramping
set points or
repetitive loops, to
the Series 996-999
EEPROM memory.
Continuous writes
may result in
premature control
failure, system
downtime and
damage to
processes and
equipment.
Table 7.7 -
IT1A to OT2B
NOTE:
The number of
decimal places
returned by many
of these com-
mands is deter-
mined by the
DEC1, DEC2, IN1
or IN2 setting.