GE IS200TBQDH1A Speedtronic Mark VI series

Description

GE General Electric Technical Specifications: IS200TBQDH1A

For the type of operation that the opto panel is generally

used, the data is handled as discrete bits. With this in mind,

we will use the MDX-PIO in the bit-control mode. For more

detail on this board, consult the MDX-PIO Operations

Manual. When operating in this mode, the board can be

configured such that I/O bits are assigned in four bit groups;

all bits within a given group must be either inputs or

outputs. This IS200TBQDH1A comes about owing to the type of interface

chips used on the MDX-PIO. The user must be aware ofthis

when it comes time to configure the opto panel. Port bits are

assigned as either input or output by strapping the PIO

accordingly. Figure 2 summarizes the various I/O straps for

the PIO. The installation of a strap selects the corresponding

bits as outputs unless.otherwise noted. Note that port B can

be strapped as two four bit quantities while port A l’!1ust be ..

IS200TBQDH1A strapped as an eight bit qi.iantity. To improve flexibility, the

cable assignments in Tables 1 and 2 provide for the first 16:

channels to be assigned to Port B1 and B2. Channels ‘7 -24

are split between Port A’ and A2. In order for the software

to use positive logic to activate the opto modules, the buffet

chips on the PIO should be the inverting type. For channel A,

74LS240 devices should be used and for channel B,

74LS242 devices shoukt be used.

The address assignment ofthe PIO is not critical owing to its

IS200TBQDH1A having “ported” .1/0 as opposed to “memory-mapped” 1/0.

For this application note; the sample software routine

expects the PIO to reside at 1/0 location SO hex. To

aCcomplish this assignment, simply strap the following pins

on J4: 3-4, 5-6, 7-8, and 9-‘ O.

SOFlWARE CONSIDERATIONS

There are two basic operation~ which are accomplished in

software: progra’mming the PIO and controlling the opto

panel. Figure 3 is a source listing for the demonstration

program. For detailsc6ncerning the programming of the

PIO, consulttheZSO-PIO section of the ZSO Microcomputer

Data Book. The software routine provided with this

application note runs the PIO as a polled device rather than

interrupt-driven. The assignment of I/O bits is dependent

upon the application. In this case, four bits are assigned as

inputs and four as outputs.

All that is necessary to proQram the PIO is the selection of bit

control mode and assignment of 1/0 bits. Once

IS200TBQDH1A programmed, the interraction between the application

software . and the physical devices which are being

controlled is simply a matter of doing 1/0 instructions to I/O

port SOH. A “‘” in one of the input bits indicates that the

device has been turned on. One nice feature of the PIO is

that the software can read back the state of the output bits.

This feature provides for storage of the state of the output

bits.

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