User guide

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
6.4
Command Summary Series 986-989, Chapter 6
CT1A Cycle Time ? <sp> CT1A <cr> S.S. relay or open col:
26 Output 1 PID Set A = <sp> CT1A <sp> data.2 <cr> 0.0 = Burst firing, or
0.1 to 999.9 sec. (time prop)
Mech relay: 5.0 to 999.9 sec.
Default: 1.0 or 10.0 sec.
CT1B Cycle Time ? <sp> CT1B <cr> S.S. relay or open col:
39 Output 1 PID Set B = <sp> CT1B <sp> data.2 <cr> 0.0 = Burst firing (brSt), or
0.1 to 999.9 sec. (time prop)
Mech relay: 5.0 to 999.9 sec.
Default: 1.0 or 10.0 sec.
CT2A Cycle Time ? <sp> CT2A <cr> S.S. relay or open col:
32 Output 2 PID Set A = <sp> CT2A <sp> data.2 <cr> 0.0 = Burst firing (brSt), or
0.1 to 999.9 sec. (time prop)
Mech relay: 5.0 to 999.9 sec.
Default: 1.0 or 10.0 sec.
CT2B Cycle Time ? <sp> CT2B <cr> S.S. relay or open col:
45 Output 2 PID Set B = <sp> CT2B <sp> data.2 <cr> 0.0 = Burst firing (brSt), or
0.1 to 999.9 sec. (time prop)
Mech relay: 5.0 to 999.9 sec.
Default: 1.0 or 10.0 sec.
DATE Factory ? <sp> DATE <cr> xxyy
122 Test Date xx = week
yy = year
DBA Deadband ? <sp> DBA <cr> -999°F to 999°F
33 PID Set A = <sp> DBA <sp> data.2 <cr> -555°C to 555°C
-999 units to 999 units
Default: 0°F, 0°C, or 0 units
DBB Deadband ? <sp> DBB <cr> -999°F to 999°F
46 PID Set B = <sp> DBB <sp> data.2 <cr> -555°C to 555°C
-999 units to 999 units
Default: 0°F, 0°C, or 0 units
DE1A Derivative ? <sp> DE1A <cr> 0.00 to 9.99 minutes
25 Output 1 PID Set A = <sp> DE1A <sp> data.2 <cr> Default: 0.00
DE2A Derivative ? <sp> DE2A <cr> 0.00 to 9.99 minutes
31 Output 2 PID Set A = <sp> DE2A <sp> data.2 <cr> Default: 0.00
DE1B Derivative ? <sp> DE1B <cr> 0.00 to 9.99 minutes
38 Output 1 PID Set B = <sp> DE1B <sp> data.2 <cr> Default: 0.00
DE2B Derivative ? <sp> DE2B <cr> 0.00 to 9.99 minutes
44 Output 2 PID Set B = <sp> DE2B <sp> data.2 <cr> Default: 0.00
DEC1 Decimal Point ? <sp> DEC1 <cr> 0 = Decimal point 0
48 Process Input 1 = <sp> DEC1 <sp> data.2 <cr> 1 = Decimal point 0.0
2 = Decimal point 0.00
3 = Decimal point 0.000
Default: 0
DEC2 Decimal Point ? <sp> DEC2 <cr> 0 = Decimal point 0
56 Process Input 2 = <sp> DEC2 <sp> data.2 <cr> 1 = Decimal point 0.0
2 = Decimal point 0.00
3 = Decimal point 0.000
Default: 0
DEV Process Deviation ? <sp> DEV <cr> Difference between SP1 and C1
5 Display Loop (IN 1)
DFL Default Unit Type ? <sp> DFL <cr> 0 = US units
140 = <sp> DFL <sp> data.2 <cr> 1 = Standard International units
DIAG Lockout ? <sp> DIAG <cr> 0 = No lockout
120 Diagnostics Menu = <sp> DIAG <sp> data.2 <cr> 1 = Read only
2 = No read or write
Default: 0
Table 6.4 -
CT1A to DIAG
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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.)