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6-34 Programming MN792
Raise/Lower
Provides a motor operated potentiometer (MOP) feature. Raise input [261], when true, increases the output at
the rate determined by increase rate [256]. Lower input [262] decreases the output as determined by decrease
rate [257]. MIN value and MAX value limits the total change by the amounts set. The output is not preserved
during power–down.
1 SETUP PARAMETERS
2 RAISE/LOWER
Reset Value
Increase Rate
Decrease Rate
Raise Input
Lower Input
MIN Value
MAX Value
External Reset
[256] Increase Rate 10.0 Seconds
[257] Decrease Rate 10.0 Seconds
Tag Parameter
[261] Raise Input
False
[262] Lower Input False
Raise / Lower
[260]
Raise/Lower
Output
Factory Setting
t
[307] External Reset False
[255] Reset Value 0.00%
[258] MIN Value
-100.00%
[259] MAX Value 100.00%
Digital
MOP
[260] Destination Tag 0
[264]
Diagnostic
Connection
Parameter Descriptions
Raise/Lower Output (Read in Diagnostics Parameters)
Refer to the diagnostics function block description.
Range: xxx.xx %
Reset Value
This reset value is preloaded directly into the output when External Reset is True, or at power–up. It
Is clamped by min and max values.
Range: –300.00 to 300.00 %
Increase Rate
Rate of change of increasing output value.
Range: 0.1 to 600.0 Seconds
Decrease Rate
Rate of change of decreasing output value.
Range: 0.1 to 600.0 Seconds
Raise Input
Command to raise output.
Range: 0 : False
1 : True
Lower Input
Command to lower output.
Range: 0 : False
1 : True
MIN Value
Minimum ramp output clamp. This is a plain clamp, not a ramped “min speed” setting.
Range: –300.00 to 300.00 %
MAX Value
Maximum ramp output clamp.
Range: –300.00 to 300.00 %
External Reset
If External Reset = true, the output of the raise/lower block = the reset value.
Range: 0 : False
1 : True
Functional Description
These waveforms illustrate the raise/lower function. When External Reset is set true, the raise/lower output
resets to reset value (default = 0.00%). When Raise Input is true, the output increases at increase rate. The
output cannot exceed MAX Value. When Lower Input is true, the output is reduced at the decrease rate. The
output cannot go below the MIN Value. Removing the raise or lower signal before the output reaches its
maximum or minimum value leaves the output at its last value. Setting both raise input and lower input to true at
the same time creates a ramp hold condition.
0%
EXTERNAL RESET
RAISE INPUT
LOWER INPUT
RAISE INPUT
100%
0%
RAISE/LOWER OUTPUT
RESET VALUE
DEFAULT=0%
INCREASE RATE
DEFAULT 10.0 SEC
DECREASE RATE
DEFAULT 10.0 SEC
t
t