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…8 COMMUNICATION
8.6 Command Mnemonics
8.6.1 General Parameters
Parameter Mnemonic
Command
Reply Interpretation
Read
(R)
Write
(W)
Operating Parameters
Measured Variable MV Yes No Dependent on the programmed display range
Instrument Status IS Yes No Range 0 to 4095 – see Fig. 8.7 on page 10
Control Set Point
Value
SP Yes No Any value within the programmed display range
Remote Set Point
Value
RP Yes No Any value within the programmed display range
Dual Set Point Value DU Yes Yes Any value within the programmed display range
Control Output OP Yes Yes 0 to 100.0 (%)
Manual Reset Value MR Yes Yes 0.0 to 9.99 (%)
Actual Valve Position VP Yes No 0.0 to 100.0 (%)
Auto/Manual State AM Yes Yes 0 = AUTO
1 = MAN
Non-Volatile Save
State
NV Yes Yes 0 = disable
1 = enable
Power Fail
State/Acknowledge
PF Yes Yes 0 = Power failure acknowledge
1 = Power failure
Self-Tune Parameters
Self-Tune Type TT Yes Yes 0 = Start Up
1 = At Set Point
Percentage Output ZS Yes Yes 0.0 to 100.0 (%)
Step from Zero
Hysteresis Value
SY Yes Yes 0.1 to 10.0 (%)
High Limit TH Yes Yes Any value within the programmed display range
Low Limit TL Yes Yes Any value within the programmed display range
Self-tune Error State TF Yes No 0 = No error/error acknowledged
1 = Process variable too close to set point
2 = Input too noisy
3 = Timer overflow
4 = Self-tune limits exceeded
5 = Maximum rate may not have been
detected
6 = Ratio of PV Amplitude/hysteresis < 4
7 = Proportional band or integral action time
P.I.D. Control Terms TM Yes Yes 0 = P only
1 = P and I
2 = P, I and D
Control Type TC Yes Yes 0 = Type A
1 = Type B
Self-tune Enable ST Yes Yes 0 = Self-tuning off
1 = Self-tuning on
Advisory
Proportional Band
AP Yes No 0.1 to 999.9
Advisory Integral
Time
AI Yes No 1 to 7200 seconds, 7201 = OFF
0 to 120 minutes, 121 = OFF
Advisory Derivative
Time
AD Yes No 1 to 999.9 seconds, 0 = OFF
0.1 to 16.65 minutes, 0 = OFF
Self-tune Accept SA Yes Yes 0 = Reject advisory values
1 = Accept advisory values
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