ABB CM30 - Page 39

ControlMaster CM30 and CM50
Universal process controllers,
1
/4 and
1
/2 DIN 7 Advanced Level
IM/CM/ED–EN Rev. B 37
…Control / …Loop 1 (2) Setpoints
RSP Ratio When the remote (external) setpoint is selected the control setpoint value is:
(ratio x remote setpoint input) + bias
RSP Bias Sets the remote setpoint bias in engineering units – see Appendix C, page 83 for description
of analog input units.
RSP Fault Action The action required when a fault occurs with the remote setpoint.
No Action
No fault action.
Local
Selects the local (internal) setpoint mode.
Local Default
Selects the local (internal) setpoint mode and sets its value to the default setpoint.
Default Setpoint Sets the value required for the local (internal) setpoint under remote setpoint fault conditions.
Ramp Mode The ramping setpoint facility can be used to prevent a large disturbance to the control
output when the setpoint value is changed. The rate set applies to both the local and the
remote setpoints.
Ramp Rate Sets the ramp rate required in engineering units / hour
Select Sources The selection of local setpoints and the changing of setpoint mode between local (internal)
and remote (external) can be controlled by digital signals; either from internal digital signals
(for example, alarm states) or from external signals via digital inputs (or digital
communications) – see Appendix
A, page 79 for description of sources.
LSP 1/2 Toggle The source required to select either local setpoint 1
(LSP1) or local setpoint 2 (LSP2). This source is
level-triggered. A low signal locks the local setpoint as
local setpoint 1 (LSP1) and a high signal locks it as local
setpoint 2 (LSP2).
LSP1 (4) Select The source required to select local setpoint 1 (LSP1) as
the current local setpoint. Selection is made on the rising
edge of the digital signal.
Local Select The source required to select local setpoint mode (or local
ratio mode when the ratio controller / station template is
selected).
100
200
PV
300
0
Displayed local setpoint value
Time
Actual (ramping) setpoint value 
used by PID algorithm*
*Example: Ramp Rate = 200 Increments / Hour
1 Hour
LSP1
LSP1
LSP2
LSP1
Local
Setpoint
Mode