Remote-processing RPC-2300 Bedienungsanleitung PDF herunterladen (Seite 19)

CHAPTER 6 DIGITAL LINES

RPC-2300 Page 17

Figure 6-2 Inductive load protection

a 1 is written to the high cur rent por t, the output is

switched on and goes low.

The output driver chip, U 20, can be replaced with a DIP

shunt jumper so it is like the other lines at J3.

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 J3, pin 26 and NOT the power connector.

Failure to do so can produce a ground loop and

cause erratic operation.

The thermal time constant of U20 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 do not share current

equally.

Interfacing to an opto-module rack

J2 and J3 I/O lines interface to an MPS-8, 16, or 24

position opto module rac k. L ines 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 rack.

A CM A-26 connects J2 and J3 on the SBS-2300 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. Be sure to

supply + 5V and ground to the appropriately marked

terminals.

You must configure the 8255 ports for outputs before

using them. Use the following table to determine the

corresponding opto channel for a particular 82C 55 port:

Opto 82C55 Connector Addr.

channels port

M0-M3 Lower C J2 2

M4-M7 Upper C J2 2

M8-M15 A J2 0

M16-M23 B J2 1

M100-M103 Lower C J3 66

M104-M107 Upper C J3 66

M108-M115 A J3 64

M116-M123 B J3 65

"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 J3 to an

opto rack, add 100 to the number on the rack. J3 has a

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

Replace U20 with a shunt jumper to operate norm ally.

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.

The logic at J3 port A, with the high cur rent outputs

installed is just the reverse. A ' 1' at a line causes the

module to turn ON.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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