Despatch P1400+ Temperature Controller - Manual (Page 54)

48
Parameter Modbus
Parameter No.
ASCII Ident &
Message Types
Notes
Rate 9 R/W D
Type 2, 3/4 R/W
Derivative Time Constant value.
Read only if Self-Tuning.
ASCII range: 0 to 99m 59secs. (99.59)
Modbus range: 0 to 5999
Output 1
Cycle time 10 R/W N
Type 2
Type 3/4
RO
R/W
0.5, 1, 2, 4, 8, 16, 32, 64,128, 256 or
512 seconds.
Scale Range
Lower Limit 11 R/W H
Type 2
Type 3/4
RO
R/W
Lower limit of scaled input range
Scale Range
Upper Limit 12 R/W G
Type 2
Type 3/4
RO
R/W
Upper limit of scaled input range
Alarm 1 Value 13 R/W C
Type 2, 3/4 R/W
Alarm 1 active at this level
Alarm 2 Value 14 R/W E
Type 2, 3/4 R/W
Alarm 2 active at this level
Manual Reset 15 R/W J
Type 2, 3/4 R/W
Bias value. 0% to 100% for single
control output or
-100% to +100% for dual outputs
Overlap /
Deadband 16 R/W K
Type 2, 3/4 R/W
20% to +20% of PB_P + PB_S ;
Negative value = Deadband
Positive value = Overlap
On / Off Differential 17 R/W F
Type 2, 3/4 R/W
0.1% to 10.0% of input span
Used for Primary output on/off
differential and for combined Primary
and Secondary on/off differential.
Decimal Point
Position 18 R/W Q
Type 2
Type 3/4
RO
R/W
0 = xxxx
1 = xxx.x
2 = xx.xx
3 = x.xxx
Read only if not Linear Input.
Output 2
Cycle Time. 19 R/W O
Type 2
Type 3/4
RO
R/W
0.5, 1, 2, 4, 8, 16, 32, 64,128, 256 or
512 seconds.
Primary Output
Power Limit 20 R/W B
Type 2
Type 3/4
RO
R/W
Safety power limit; 0 to 100 %.
Actual Setpoint 21 RO Current (ramping) value of selected
setpoint.
Setpoint Upper
Limit 22 R/W A
Type 2
Type 3/4
RO
R/W
Maximum setpoint value. Current SP
to Input Range Maximum
Setpoint Lower
Limit 23 R/W T
Type 2
Type 3/4
RO
R/W
Minimum setpoint value. Current SP
to Input Range Minimum