Yaskawa MicroTrac DSD Drives Thumbwheel Selector - Manual (Page 2)

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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 (J1-
A 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