User guide

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
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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 OT3
NOTE:
The number of
decimal places
returned by many
of these com-
mands is deter-
mined by the
DEC1, DEC2, IN1
or IN2 setting.
(This does not
apply to Modbus
Protocol.)