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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.
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