Despatch P1400+ Temperature Controller - Manual (Page 53)

47
Parameter Modbus
Parameter No.
Notes
Alarm 1 Status 5 RO 1 = Active, 0 = Inactive
Alarm 2 Status 6 RO 1 = Active, 0 = Inactive
Setpoint Ramping 7 R/W 1 = Enable(d), 0 = Disable(d)
Loop Alarm Status 10 R/W 1 = Active/Enable, 0 = Inactive/Disable
Loop Alarm 12 R/W Read to get loop alarm status. Write 0/1 to
disable/enable.
Digital Input 2 13 RO State of Option B digital input.
To set the bit value to 1 write FF, to set the bit value to 0 write 00. Refer to Function Code 05 in the
Modbus Communications section.
Word Parameters
Table 14. 1400+ Communications - Word Parameters
Parameter Modbus
Parameter No.
ASCII Ident &
Message Types
Notes
Current value of PV.
If under-range = 62976 (5 ASCII)
If over-range = 63232 (0 ASCII)
Process Variable 1 RO M
Type 2 RO
If Sensor break = 63488 (ASCII = n/a)
Setpoint 2 R/W S
Type 2
Type 3/4
RO
R/W
Value of currently selected setpoint.
(Target setpoint if ramping).
Parameter is read only if the current
setpoint is RSP.
Output Power 3 R/W W
Type 2
Type 3/4
RO
R/W
0% to 100% for single output;
−
100%
to +100% for dual output control.
Read Only if not in manual control.
Deviation 4 RO V
Type 2 RO
Difference between Process Variable
and Setpoint (value = PV-SP)
Secondary
Proportional Band 5 R/W U
Type 2, 3/4 R/W
Adjustable 0.0% to 999.9% of input
span. Read only when Self-Tuning.
Primary
Proportional Band 6 R/W P
Type 2, 3/4 R/W
Adjustable 0.0% to 999.9% of input
span. Read only when Self-Tuning.
Direct / Reverse
Acting 7 R/W 1 = Direct Acting, 0 = Reverse
Automatic Reset
Time
(or Loop Alarm
Time) 8 R/W I
Type 2, 3/4
R/W Integral Time Constant value.
(or Loop Alarm Time value in ON/OFF
control mode if Loop Alarm Enabled)
Read only if Self-Tuning.
ASCII range: 0 to 99m 59sec (99.59)
Modbus range: 0 to 5999