Remote-processing RPC-2350 Uživatelský manuál stáhnout pdf (Strana 48)

ANALOG I/O CHAPTER 8

8-6

and can be either 0 or 1. channel 0 is on pin 17 and

1 is on pin 19.

value is the value to output from 0 to 4095.

Use the following table to convert from a desired voltage

to a value.

Range Formula

0 to 5V value= V * 819

0 to 10V value= V * 409.5

-5 to + 5V value= V * 409.5 + 2047.5

The result of the formula produces a number which can

be used in place of value.

Output Current

D/A output impedance is 0. 5 ohms. Short cir cuit

current is 40 mA . T he analog po wer su pply limits this

current to something a little less. Practical maximum

output current from a D/A is 10 mA.

Noise

Analog outputs generate noise in the 100KHz +

frequency ran ge. Many devices ar e not affected by this

noise. However, if noise is a problem, put a capacitor

(1 µF or so) on the output. Pads are provided at C23

and C24 near J7. C23 filters output 0 and C24 filters

output 1.

4-20 mA. OUTPUT

Two 4-20 mA. outputs are optionally available.

Interface is at J12. Current outputs are driven by the

voltage DAC' s. Configur e each DAC used for 0-10V

output to drive the curr ent output.

Analog output 1 may be optionally used for software

contrast control on the LCD graphics display. When it

is used for this purpose, 4-20 mA output may not be

used for this channel.

When you use a DAC to drive a current output, it cannot

be used for voltage output.

Current output is proportional to the DAC voltage

driving it. To program a current, you program a voltage

using the AOT command. T hus, 0 V output supplies 4

mA. output while 10V output supplies 20 mA.

The following table lists J12 pin number, DAC , and

current output.

Output

No.

J12 pin DAC driver Current

0 2 U11 (AOT 0) U30

1 10 U12 (AOT 1) U31

The follow ing table is J12 pin ou t.

Pin No. Function

1 .+ 12V, 40 m A. supply from RPC-2350

2 Current loop 0 output

3,5, 6,9 Ground

4 Current loop 0 voltage power input

6 7-30V input from P2

8 Current loop 1 voltage power input

10 Current loop 1 output

Jumper W12 for 0-10V output for each channel you will

use as current output. See table in Analog Output above

for jumper instructions.

IC Installation

Current output IC’s are installed in U30 and U31. See

Figure 8-5 for location. The notch in the IC designates

the top. Pin 1 is the upper left of the chip. Orient the

board as shown in Figure 8-5 and install the chips in U30

for channel 0 and/ or U 31 for ch annel 1, keeping pin 1 to

the upper left.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 82 83

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