Super Systems 3 Series - Manual (Page 72)

Operations Manual Series 3
72
Parameter
Mnemonic Parameter Name Modbus Address
Decimal
CTRL.A
Control Action
0 = Reverse Acting
1 = Direct Acting 7
Ti Integral Time
(0 = No Integral Action) 8
Td Derivative Time
(0 = No Derivative Action) 9
RNG.LO Input Range Low Limit 11
RNG.HI Input Range High Limit 12
A1.--- Alarm 1 Threshold 13
A2.--- Alarm 2 Threshold 14
SP.SEL Active Setpoint Select
0 = Setpoint 1
1 = Setpoint 2 15
D.BAND Channel 2 Deadband 16
CB.Lo Cutback Low 17
CB.HI Cutback High 18
R2G Relative Cool/Ch2 Gain 19
MTR.T Motor Travel Time 21
SP1 Setpoint 1
NB – do not write continuously changing values to this variable. The memory technology used in this product has a limited
(100,000) number of write cycles. If ramped setpoints are required, consider using the internal ramp rate function or the
remote comms setpoint (Modbus address 26 )in preference. 24
SP2 Setpoint 2
NB – do not write continuously changing values to this variable. The memory technology used in this product has a limited
(100,000) number of write cycles. If ramped setpoints are required, consider using the internal ramp rate function or the
remote comms setpoint (Modbus address 26 )in preference. 25
Rm.SP
Remote (comms) setpoint. If selected using the remote setpoint selection (address 276 below, may also be controlled using
the instrument HMI or a digital input) then this is used as a setpoint providing a value has been received within a window of
about 5 seconds. If no value is received then the controller falls back to the currently selected setpoint (SP 1 or SP 2) with an
error indication. The Remote Setpoint may have a local trim (SP Trim, address 27) added to it to compensate for variations in
temperature in a particular zone.
This parameter is not saved when the instrument is switched off. It may be written to continuously over communications
without risk of damage to the instrument non-volatile memory.
26
LOC.t Local Trim – added to the remote setpoint to compensate for local temperature variations in a control zone. 27
MR Manual Reset 28
OP.HI Output High Limit 30
OP.LO Output Low Limit 31
SAFE Safe Output Value for Sensor Break or other fault conditions. 34
SP.RAT Setpoint Rate Limit Value (0 = no rate limit) 35
P.Err Calculated Error (PV-SP) 39
A1.HYS Alarm 1 Hysteresis 47
A2.HYS Alarm 2 Hysteresis 68
A3.HYS Alarm 3 Hysteresis 69
A4.HYS Alarm 4 Hysteresis 71
StAt
Instrument Status. This is a bitmap:
B0 – Alarm 1 Status
B1 – Alarm 2 Status
B2 – Alarm 3 Status
B3 – Alarm 4 Status
B4 – Auto/Manual Status
B5 – Sensor Break Status
B6 – Loop Break Status
B7 – CT Low load current alarm status
B8 – CT High leakage current alarm status
B9 – FEATURE NOT AVAILABLE
B10 – PV Over-range (by > 5% of span)
B11 – CT Overcurrent alarm status
B12 – New Alarm Status
B13 – FEATURE NOT AVAILABLE
B14 – Remote (comms) SP Fail
B15 – Auto-tune Status
In each case, a setting of 1 signifies ‘Active’, 0 signifies ‘Inactive’. 75