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
6.10
Command Summary Series 986-989, Chapter 6
PID2
PID Set Crossover
? <sp> PID2 <cr>
0 = Process
101
Source Selection
= <sp> PID2 <sp> data.2 <cr>
1 = Set point
2 = None
Default: 0
PRC1
Process Range
? <sp> PRC1 <cr>
0 = 4-20mA
68
Output 1
= <sp> PRC1 <sp> data.2 <cr>
1 = 0-20mA
2 = 0-5V
Î
(dc)
3 = 1-5V
Î
(dc)
4 = 0-10V
Î
(dc)
Default: 0
PRC2
Process Range
? <sp> PRC2 <cr>
0 = 4-20mA
71
Output 2
= <sp> PRC2 <sp> data.2 <cr>
1 = 0-20mA
2 = 0-5V
Î
(dc)
3 = 1-5V
Î
(dc)
4 = 0-10V
Î
(dc)
Default: 0
PRC3
Process Range
? <sp> PRC3 <cr>
0 = 4-20mA
91
Output 3
= <sp> PRC3 <sp> data.2 <cr>
1 = 0-20mA
2 = 0-5V
Î
(dc)
3 = 1-5V
Î
(dc)
4 = 0-10V
Î
(dc)
Default: 0
PROC Process Value for
? <sp> PROC <cr>
RL1 to RH1
102
PID A <-> B Switch
= <sp> PROC <sp> data.2 <cr>
Default: per IN1 and hardware
PWR
Percent Power
? <sp> PWR <cr>
-100% to 100%
6
Present Output
n/a
RA1A
Rate Output 1
? <sp> RA1A <cr>
0.00 to 9.99 minutes
23
PID Set A
= <sp> RA1A <sp> data.2 <cr>
Default: 0.00
RA1B
Rate Output 1
? <sp> RA1B <cr>
0.00 to 9.99 minutes
36
PID Set B
= <sp> RA1B <sp> data.2 <cr>
Default: 0.00
RA2A
Rate Output 2
? <sp> RA2A <cr>
0.00 to 9.99 minutes
29
PID Set A
= <sp> RA2A <sp> data.2 <cr>
Default: 0.00
RA2B
Rate Output 2
? <sp> RA2B <cr>
0.00 to 9.99 minutes
42
PID Set B
= <sp> RA2B <sp> data.2 <cr>
Default: 0.00
RE1A
Reset Output 1
? <sp> RE1A <cr>
if ALGO = 0, 1, or 3, then
22
PID Set A
= <sp> RE1A <sp> data.2 <cr>
0.00 to 9.99 repeats/min.
if ALGO = 2, then -100.0% to 100.0%
Default: 0.00 repeats/min. or 0.0%
RE1B
Reset Output 1
? <sp> RE1B <cr>
if ALGO = 0, 1, or 3, then
35
PID Set B
= <sp> RE1B <sp> data.2 <cr>
0.00 to 9.99 repeats/min.
if ALGO = 2, then -100.0% to 100.0%
Default: 0.00 repeats/min. or 0.0%
RE2A
Reset Output 2
? <sp> RE2A <cr>
if ALGO = 0, 1, or 3, then
28
PID Set A
= <sp> RE2A <sp> data.2 <cr>
0.00 to 9.99 repeats/min.
if ALGO = 2, then -100.0% to 100.0%
Default: 0.00 repeats/min. or 0.0%
RE2B
Reset Output 2
? <sp> RE2B <cr>
if ALGO = 0, 1, or 3, then
41
PID Set B
= <sp> RE2B <sp> data.2 <cr>
0.00 to 9.99 repeats/min.
if ALGO = 2, then -100.0% to 100.0%
Default: 0.00 repeats/min. or 0.0%
RH1
Range High
? <sp> RH1 <cr>
min. IN1 range to to max. IN1 range
50
Input 1
= <sp> RH1 <sp> data.2 <cr>
Default: Sensor high range
RH2
Range High
? <sp> RH2 <cr>
min. IN2 range to to max. IN2 range
58
Input 2
= <sp> RH2 <sp> data.2 <cr>
Default: Sensor high range
Table 6.10 -
PID2 to RH2
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.
