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Manual reset (bias), On/off differential, Overlap/deadband – West Control Solutions N6600 User Manual

Page 66: Proportional band 1 value, Proportional band 2 value, Status parameters, Controller status

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5.3.7.3 MANUAL RESET (BIAS) {P} = J

This parameter may be modified/interrogated using a Type 2 message or a Type

3/4 message sequence. The decimal point position is as for the input range.

5.3.7.4 ON/OFF DIFFERENTIAL {P} = F

This parameter may be modified/interrogated using a Type 2 message or a Type

3/4 message sequence. It defines the switching hysteresis (for Controllers with an

ON/OFF control output - primary or secondary output). The decimal point position

= 1.

5.3.7.5 OVERLAP/DEADBAND {P} = K

Applicable to a dual control output instrument only, this parameter may be

modified/interrogated using a Type 2 message or a Type 3/4 message sequence.

It may be set to positive and negative values (a positive value indicates overlap,

a negative value indicates deadband). The decimal point position = 0.

5.3.7.6 PROPORTIONAL BAND 1 VALUE {P} = P

This parameter may be modified/interrogated using a Type 2 message or a Type

3/4 message sequence. This may be set to 0.0 (for On/Off control) or to a value in

the range 0.5% - 999.9% of Output 1 power range. The decimal point position is

set to 1.

5.3.7.7 PROPORTIONAL BAND 2 VALUE {P} = U

For a dual control output instrument, this parameter may be modified/interrogated

using a Type 2 message or a Type 3/4 message sequence. This may be set to 0.0

(for On/Off control) or to a value in the range 0.5% - 999.9% of Output 2 power

range. The decimal point position is set to 1.

5.3.8 Status Parameters

5.3.8.1 CONTROLLER STATUS {P} = L

This parameter may be interrogated only, using a Type 2 message. The status

information is encoded in the four digits as the decimal representation of a binary

number. Each bit in the binary number has a particular significance (see NOTES

ON TABLE 5-2).

5.3.8.2 ARITHMETIC DEVIATION

(PROCESS VARIABLE - SETPOINT) VALUE {P} = V

This parameter may be interrogated only, using a Type 2 message. It is the

difference between the current process variable value and the current setpoint

value.

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PM-0075