AutomationDirect DL205, Руководство пользователя

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DL205 Analog Manual, 7th Edition Rev. D
15-25
Chapter 15: F2-8AD4DA-1 8-Ch. In / 4-Ch. Out Analog Current Combination
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Input Engineering Unit Conversion Example 4:
Data format = binary,
Channel 1 data memory location = V2000,
Channel 1 resolution = 16 bits,
Channel 1 engineering units = 0.0–140.0 PSI,
Channel 1 input device = 4–20 mA transmitter.
Using the Input Track and Hold Feature
The input Track and Hold feature allows the individual inputs to be separately configured
to maintain their maximum or minimum data values. If No Track and Hold is selected, the
present real time value of the input will be stored in the input data V-memory location. If
Track and Hold minimum value is selected, the first input value less than or equal to full
scale will be read and maintained until a lower value is measured, or until Track and Hold
is reset. If maximum value is selected, the first input value greater than or equal to zero will
be read and maintained until a higher value is measured, or until Track and Hold is reset.
To reset Track and Hold, write a value of one to the Track and Hold selection high and low
bits. When Track and Hold is reset, the module will display the real-time input value. When
the selection is changed from reset to minimum value or maximum value, the input will start
over as described previously.
BTOR
Convert from binary to real data format.
SUBR
R13107
MULR
R1400
Subtract 13107;
16 bit digital value for 4mA offset.
(Use R3277 for 14 bit; R819 for 12 bit.)
(This rung not used if input transmitter is 0--20 mA.)
Multiply by 1400;
EU range X 10 for implied decimal.
DIVR
R52428
Divide by 5248;
16 bit digital range for 4--20 mA.
(Use R13106 for 14 bit; R3276 for 12 bit.)
(For 0--20 mA xmitter: use 16 bit R65535, 14 bit R16383, 12 bit R4095.)
RTOB
Convert to binary data format.
OUT
V2100
Store input EU value in V2100.
LD
V2000
C0
Load input channel 1 digital value into accumulator.
(If input not less than 4mA.)
OUT
C0
V2000
K3333
C0 is on when analog input is less than 4mA;
3333 hex = 13107 = 4mA @ 16 bits.
(Use KCCD for 14 bit; K333 for 12 bit.)
(This rung not used if input transmitter is 0--20 mA.)
OUT
V2100
Store value of 0 in V2100
(This rung not used if input transmitter is 0--20 mA.)
LD
K0
Load value of 0 into accumulator.
(If input less than 4mA.)
(This rung not used if input transmitter is 0--20 mA.)
C0