Remote-processing RPC-52 Bedienungsanleitung PDF herunterladen (Seite 21)

CHAPTER 6 DIGITAL AND OPTO PORTS

Page 19

lines. The MPS-XX series boards accept G4 and/or G5

series modules.

A CM A-26-18 connects J4 on the RPC-52 to the MPS-

XX board. Cable length should be less than 2 feet.

Excessive cable lengths will cause a voltage drop and

consequently unreliable operation. Make sure you

connect + 5 V and gr ound to the M PS-16 and -24 opto

racks. The MPS-08 r ack obtains its power through the

ribbon cable.

Before a line can be accessed or r ead, the 8255 chip

must be initialized. This is done using the CONFIG

LINE statem ent. Refer to Table 6-1 for Opto module

position, port num ber, and connector pin out. If opto

channels 16-23 are used, U20 should be replaced by a

DIP shunt jumper.

The LINE and LINE # com mands are used to control

and access opto modules and lines. These commands are

both functions and statements, depending upon how they

are used.

100 LINE 100, 0 Statement

110 LINE #103, 0 Statement

120 A = LINE(100) Function

130 A = LINE#(103) Function

Program line 100 turns external opto module rack

position 0 off. Program line 110 sets J4, pin 3, to a

logical 0 level. Program line 120 returns the status of

external opto module rack position 0. If the module is

"off", a 1 is returned (assuming it is an output module).

Program line 130 returns the status of J4, pin 3 as a 0 or

Example: To turn on opto module in slot position 8, the

following command is executed:

LINE 108, 1

A ' 1' turns on a module while a 0 turns it off. (In actual

fact, a 0 is written at the port. )

Interfacing to switches and other devices

The STB-26 terminal board provides a convenient way

of interfacing switches or other digital I/O devices.

Lines at J4 are connected to the STB-26 with a CMA-26

cable. Digital devices are then connected to the screw

terminals on the ST B-26. The M PS-XX series opto

racks also provide a way to access digital I/ O lines.

Switches may be connected directly to a line. When

jumper W9 configures the resistors as pull ups, a switch

closure to ground at a line is read as a 0 using the LINE

# function.

When W9 configures the input resistors as pull downs,

one end of the switch must be tied to + 5 volts. If this is

not possible or convenient, a 1K resistor can be tied

between an input and + 5 volts to force it high when a

switch is open.

Digital I/ O prog ramm ing exam ple

The follow ing exam ple reads a switch at po rt A, bit 3

(J4-25) (program line 200), reads opto module channel 1

(program line 210) and turns on opto module at channel

5 (program line 220). A LED is controlled through the

high current port at J3-10 (port B, bit 0) (program lines

230 and 240).

200 D = LINE #(125)

210 F = LINE(1)

220 LINE 105, 1

230 LINE #110,1 :REM Turn on LED

240 LINE #110,0 :REM Turn off LED

Note that the LINE statement is used to control both opto

modules and individual lines.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 35 36

Kommentare zu diesen Handbüchern

Keine Kommentare

Remote-processing RPC-52 Bedienungsanleitung Seite 21

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Computers Remote-processing RPC-52