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CHAPTER 6 DIGITAL LINES

RPC-150 Page 15

Figure 6-2 Inductive load protection

The output driver chip, U 13, can be replaced with a DIP

shunt jumper so it is like the other lines at J2. Install the

jumper so U13 pin 1 goes to pin 18.

NOTE: Outputs at the high current lines are not

compatible with TT L logic levels and should

not be used to drive other logic devices.

Each of the high current outputs can sink 100 ma at 50V.

WARNING:

External supplies using the high current outputs must

be tied to J2, pin 26 and NOT the power connector.

Failure to do so can produce a ground loop and

cause erratic operation.

The ther mal time constant of the package is very short,

so the number of outputs that are on at any one time

should include those that overlap even for a few

milliseconds.

Incandescent lamps have a "cold" current of 11 times its

operating current. Lamps requiring more than 50 ma

should not be used.

Protection diodes m ust be used with inductive loads.

Refer to figure 6-2

Do not parallel outputs for higher drive. This could

result in damage since outputs will not share current

equally.

Interfacing to an opto-module rack

J2 and J3 I/O lines can be interfaced to an MPS-8, 16,

or 24 position opto module rack. Lines not going to an

opto module connect to a screw terminal on the MPS-

XX series boards. This feature allows you to connect

switches or other TTL type devices to the digital I/O

lines. The MPS-XX series boards accept G4 series

modules.

Use the O PTO comm and to access and control G4 opto

modules. The LIN E comm and is used to access

individual lines on the STB-26 or MPS-X X board.

A CM A-26 connects J2 and J3 on the RPC-150 to the

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

for the 8 position rack and 18 inches for the 16 and 24

positions. Excessive cable lengths cause a high voltage

drop and consequently unreliable operation. Connect

+ 5V and ground to the opto racks.

You must configure the 8255 ports for outputs using the

CON FIG PIO statement. Use the following table to

determine the corresponding opto channel for a

particular 82C55 port:

Opto 82C55 Connector Addr.

channels port

M100-M103 Lower C J2 514

M104-M107 Upper C J2 514

M108-M115 A J2 512

M116-M122 B J2 513

M123 not available

M0-M3 Lower C J3 2

M4-M7 Upper C J3 2

M8-M15 B J3 1

M16-M23 A J3 0

"Opto channel" is the position as marked on the MPS-xx

board. The channel number is preceded by a 'M'

character on the MPS board. When connecting J2 to an

opto rack, add 100 to the number on the rack. J2 has a

high current output on port B (channels M8-M15).

Replace U13 with a shunt jumper to operate norm ally.

You will have to group your inputs and outputs on the

rack to make best use of the space. See Digital I/O

Program ming Ex ample later in this chapter for

information about using these commands. Pay attention

to how LINE differs from OPTO in addressing and

polarity.

To turn on an opto module, an output line must be low.

A module is turned off by wr iting a ' 1' to a channel.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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