Remote-processing RPC-52 Bedienungsanleitung PDF herunterladen (Seite 18)

DIGITAL AND OPTO PORTS CHAPTER 6

Page 16

Figure 6-1 Digital I/O

INTRODUCTION

Digital I/O lines ar e used to inter face with opto-module

racks, switches, low current LED's, and other TTL

devices. The RP C-52 ha s 24 of these lines a vailable

through J4. 8 of these lines are high current outputs,

capable of sinking 75 to 200 ma. Additionally, there are

4 opto-module sockets on the card itself.

On-car d opto-mo dule slots accept G4 and G 5 series op to

modules. G4 series opto modules are used to sense the

presence of AC or DC voltages or switch them.

Maximum switching cur rent is 3 amper es.

G5 series are optically isolated analog input or output

modules. The modules connect to thermocouples,

RTD' s, load cells, 4-20 ma current loops, and general

purpose voltage inputs. They can also output voltages

and currents. These modules are supported by the

G5MOD command. Input modules return a number

from 0 to 255 in a manner similar to an A-D.

Conversion time is 7 milli-seconds.

In addition to the 24 I/O lines from J4, the display port

can be used as digital I/O. Refer to chapter 8 for more

information.

Two on card opto rack slots may be jumpered for PWM

output.

WARNING:

Apply power to the RPC -52 before applying a

voltage to the digital I/O lines to prevent current

from flowing in and damaging devices. If you

cannot apply power to the RPC-52 first, contact

technical support for suggestions appropriate to your

application.

This chapter is divided into two sections. T he first

section is about the on-card opto rack. The second

section refers to the digital I/O port J4.

ON-CARD OPTO RACK

Description

The on-card opto r ack accepts the G4 ser ies opto

modules (manufactured by Opto-22, Grayhill, and

others). These modules can switch AC or DC voltages

from 5 to 240 volts at 3 amperes. They can also sense

input voltages of the same type and range.

Opto channels 0 and 1 can be jumpered for PWM

outputs. PWM output is also used to generate analog

output.

The RPC-52 also accepts the G rayhill G5 series. These

modules m easure voltage, current, therm ocouple output,

or RTD resistance and return it as a frequency.

Additionally, modules c an output a voltage or a current.

RPBASIC-52 supports the G5 series through the

G5MOD comm and.

Installation

G4 and G5 modules are installed in the same manner as

an opto rack. A screw at the top is used to secure the

module to the board. M odules may be installed in any

order and types can be intermixed.

A hole for a standoff nea r the modules is provided to

keep the board from bending during installation or

removal.

Input and output lines are fastened by the two position

terminal in front of the opto mo dule. The module

number is in each module position and behind the

module. This module position is used in conjunction

with the LINE statement.

Refer to the appropriate module data sheet for additional

hookup information, if required.

G4 operation

G4 modules are accessed using the LINE command and

function. Line numbers are from 0 to 3. To turn on a

module, execute the fo llowing statem ent:

100 LINE 2,ON

To return the status of a line, execute the following:

200 A = LINE(3)

PWM O utput

Opto module positions 0 and 1 may be jumpered for

PWM output. Power up frequency and duty cycle are

set using the CONF IG PW M statem ent. The duty c ycle

is changed during run time using the PW M statem ent.

See the RPBASIC-52 Software Supplement for

information on these co mma nds. The frequency is

adjustable from approximately 170 Hz to 40 Khz. The

frequency is the sam e for both channels. Duty cycle is

adjustable with a 1/255 resolution. Each channel is set

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 35 36

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