Remote-processing RPC-210 Instrukcja Użytkownika Pobierz pdf (Strona 43)

ANALOG I/O BASIC SECTION 10

Page 10-1

Figure 10-1 Analog IO Connector and Jumpers

INTRODUCTION

ANALOG I/O SECTION 10

There are eight single ended analog to digital (A-D)

input channels and 2 output channels on the RPC-210.

An additional ninth input channel measures the

temperature on the CPU reference.

Input channels can measure voltages from transducers,

transmitters, 4-20 ma current loops, thermistors, etc.

Input voltage range is 0. 1 to 5 or 0. 1 to 2.5 volts.

Range is set by jumpers W11 & W 12. Resolution is 12

bits (4095 counts). Input impedance is 1M ohm to

ground. C onversio n time using R PBasic-52 is 2 milli-

second.

Output channels are used to control motor speeds, drive

4-20 mA current modules, or a panel meter.

The RPBASIC-52 averages 8 measurements to reduce

noise before the AIN command returns a number.

There are 2 voltage references which set the I/O range.

One reference is adjustable to 5.00 volts. T he other is

fixed at 2. 45 to 2. 55 V. Maxim um input vo ltage is

jumper selectable via W11 for 0.1-5 or 0. 1-2.5V. When

W11 is installed, range is 0.1-2.5V.

W12 selects a power source for the analog buffers.

When operating in the 0.1 to 5V range, I/O is noisier.

See SETTIN G INPU T RAN GE for m ore information.

This section begins with basic information to connect and

use analog inputs. Later, descriptions of how to measure

voltages other than 2.5 or 5 volts and calibration are

presented.

Be sure to read the information in "CALIBRATION " at

the end of this section. It provides inf orm ation to

compensate for offset and conversion er rors.

CONNECTING ANALOG LINES

All analog inputs interface through connector J10. A

STB-20 terminal board and CM A-20 ribbon cable can be

used to provide screw terminal interface. Additional

components, such as resistors and capacitors, may be

connected directly to the screw term inals.

For greatest accuracy, connect unused inputs to ground.

In environments with high voltage or static electricity,

unused inputs can bleed over to other channels.

R16 is adjusted to trim accuracy and/or maximum

voltage to your system. See Calibration later in this

section for more information.

SETTING INPUT RANGE

A/D and D/A ranges are configured for either 0. 1 to 2.5

or 0.1 to 5V by jumper W11. Ranges cannot be changed

in software. You can always set the input range to 2.5V

and install a series resistor as described in MEASURING

HIGHER VO LTAG ES.

We recommend using analog I/O in the 0.1 to 2. 5V

range to ensure greatest accuracy and lowest noise.

When W11 is installed, ranges are 0.1 to 5V. Removed,

the range is 0.1 to 2.5V.

W12 sets the + supply voltage to the analog buffers.

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