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Appendix B: CRC-16 Calculation

38 Modbus® RTU Serial Communications User Manual 02/13

A.5 Loop Value Register Map

This table contains addresses of Loop #1; see Table A-1 on page 27 for addresses of other loops.

Address

(hex)

(decimal)

Parameter Name Access Notes

0040 40065 PV R Floating Point in Engineering Units.

0042 40067 RV; Remote Set Point; SP2 R Floating Point in Engineering Units.

RSX,

VPR, VRX, UDC5300 allow writing

this value when SP2 is local (not connected)

0044 40069 Working Set Point R Floating Point in Engineering Units.

RSX, VRX,

VPR, UDC5300,: R/W

On a write to this register the instrument

will update the proper set point according to

the loop’s currently selected set point.

0046 40071 Output R/W Floating Point in Engineering Units.

UDC2500, UDC3200, UDC3500

Read Only

0048 40073 Input #1 R Floating Point in Engineering

004A 40075 Input #2 R Floating Point in Engineering Units.

004C 40077 Gain #1 (Prop Band #1 if active) R/W Floating Point

For loop #2 this cell is UDC330 Gain #3 or

UDC3500 Gain #5

004E 40079 Direction R Floating Point

0.0=Direct; 1.0=Reverse

0050 40081 Reset #1 R/W Floating Point in Repeats/Minute or

Minutes/Repeat.

For loop #2 this cell is UDC3300 Reset #3 or

UDC3500 Reset #5

0052 40083 Rate #1 R/W Floating Point in Minutes

For loop #2, this cell is UDC3300 rate #3 or

UDC3500 rate #5

0054 40085 Cycle Time #1 R/W Floating Point in Seconds.

Read-only for UDC2300, UDC3300.

For loop #2 this cell is UDC3300 Cycle Time #3

or UDC3500 Cycle Time #5

0056 40087 PV Low Range R Floating Point in Engineering Units.

0058 40089 PV High Range R Floating Point in Engineering Units.

005A 40091 Alarm #1 SP #1 R/W Floating Point in Engineering Units. Note 2

005C 40093 Alarm #1 SP #2 R/W Floating Point in Engineering Units. Note 2

005E 40095 unused

0060 40097 Gain #2 (Prop Band #2 if active) R/W Floating Point

For loop #2 this cell is UDC3300 Gain #4 or

UDC3500 Gain #6

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 75 76

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