Remote-processing RPC-2300 Manuel d'utilisateur télécharger pdf (Page 24)

ANALOG I/O CHAPTER 8

Page 22 RPC-2300

Figure 8-1 Analog I/O

INTRODUCTION

The SBS-2300 has eight single ended or four differential

analog input channels than can be interfaced to external

analog devices. These channels can be used to measure

voltages from transducers, 4-20 ma current loops,

thermistors, etc. The converter reads a voltage and

returns a 12 bit (4096 count) number in under a m illi-

second . Inp uts are pr ogr am ma ble for 0 to + 5 or ±5

volt, single ended or differential mode.

Additionally, 2 analog outpu t channels w ith 12 bit

accuracy are available. Output voltage is 0-5V, 0-10V,

or ±5V.

Capacitors may be added to pads located adjacent to the

A/D converter (U10). This will help reduce noise on

analog inputs. Capacitor values are application

dependent. 0.01 mfd is a good value to start from.

Higher values may be used in extremely noisy

environments or when time between samples is long (>

100 ms).

The AIN function is used to return a voltage while AOT

comm ands an outpu t.

This chapter begins with basic hook-up information, then

proceeds to initialization, data reading, and calibration.

Analog output option is discussed near the end.

CONNECTING ANALOG I/O

Analog I/O interface via J7. The STB-20 terminal board

may be used to bring signals to terminal blocks.

The following table defines the signal pin out from

analog I/O port J7.

J7 Signal

Pin #

1 CH0 input

2-16 Ground (even pins)

3 CH1 input

5 CH2 input

7 CH3 input

9 CH4 input

11 CH5 input

13 CH6 input

15 CH7 input

17 DAC 0 output

18 + 12V

19 DAC 1 output

20 -12V

Initializing Inputs

The SBS-2300 can have up to eight single-ended inputs,

four differential, or a mixture of single ended and

differential inputs. Each analog input you intend to use

must be initialized. Initialization is performed using the

CON FIG A IN command. The syntax is:

CONFIG AIN channel, input, range

Where:

channel is from 0 to 7 for single-ended inputs or 0-6

for differential. Differential inputs require 2 lines.

The channels you specify in a "mixed" application

depends upon what lines are used for single ended

and differential. Refer to the table below for single

ended and differential channels

Polarity + - + - + - + -

J7 pin # 1 3 5 7 9 11 13 15

Differential

Channel 0 0 2 2 4 4 6 6

Single ended

Channel 0 1 2 3 4 5 6 7

For example, if you wanted one differential input,

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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