Yaskawa MicroTrac DSD User Manual

I/O 875

INPUT/OUTPUT DEVICE

USER REFERENCE SHEET

FOR

THUMBWHEEL SELECTOR SWITCH ASSEMBLY

Part No. 46S02875-XXXX

For use with MicroTrac DSD Local or Remote Input/Output boards

FRONT VIEW OF ASSEMBLY

THUMBWHEEL
SWITCH
BANK

DECIMAL LOCATER

PRINTED
CIRCUIT
BOARD

JUMPER

REAR VIEW OF

PRINTED CIRCUIT BOARD

BANK SELECT

J2

8 7 6 5 4 3 2 1 0

J1B
J1A

TB1

Effective 5/30/90

1

INTRODUCTION

The Thumbwheel Selector Switch
Assembly may be interfaced to any of the
Local or Remote I/O boards that support
thumbwheel inputs. The Thumbwheel
Selector Switch Assembly comes in many
configurations, such as number of digits,
decimal point location, and whether or not a
sign selector is present.

HARDWARE DESCRIPTION

CONFIGURATION

One bank of thumbwheel switches is
mounted to a printed circuit board to form
this assembly. The Thumbwheel Selector
Switch Assembly comes in many
configurations; up to 6 digits, or 4 or 5 digits
and a +/- sign selector, may be included in
the switch bank mounted on this printed
circuit board. In addition, a decimal point
location spacer may be mounted. The
assembly is designed for mounting in a
panel cutout, held in place by tension clips
on the ends of the switch bank.

POWER REQUIREMENTS

The Thumbwheel Selector Switch
Assembly receives input power (+24VDC and
COMMON) via the Thumbwheel Switch
Interface (ribbon cable connection) from the
Local or Remote I/O board to which it is
interconnected, either directly or as part of a
daisy chain.

INPUT/OUTPUT BOARD INTERCONNECT

There are two 26 pin connectors (J1­A and J1-B) on the assembly's printed

circuit board that are to be connected to a
Local or Remote I/O board, or to other
Thumbwheel Selector Switch Assemblies,
through use of 26 conductor ribbon cables.
The cable is intended to be connected in a
daisy chain style from Thumbwheel Selector
Switch Assembly to Thumbwheel Selector
Switch Assembly, originating from the Local
or Remote I/O board.

NOTE

When used as a Local I/O device for
a MicroTrac DSD drive, the ribbon
cable conection to the Local I/O
board can be made directly, without
the need of a Terminal Transition
Adapter PCB.

PUSH TO LOAD

In addition, a PUSH TO LOAD input
may be connected to this printed circuit
board. When the PUSH TO LOAD input is
connected to COMMON (either through a
push button or directly tied), then the input
is asserted. A connection terminal for the
PUSH TO LOAD input and a connection
terminal that supplies COMMON are
provided TB1 on the printed circuit board.
PUSH TO LOAD affects all thumbwheel
switches connected (i.e. daisy chained) to
this printed circuit board.

INSTALLATION AND HOOKUP

This assembly is factory installed and
should require no further connections to be
made to it. However, if it should become
necessary to install the assembly in the
field, then the following steps should be
taken:

I/O 875

2