Yaskawa Remote logic I/O PCB for use with Microtrac DSD LAN - Manual (Page 3)

INTRODUCTION
The Remote Logic I/O [Input/Output]
PCB (LOGIO) adds I/O capability to a
Remote I/O Controller LAN Node PCB (RIO)
in a MicroTrac DSD system. The LOGIO is
connected to the RIO through use of an I/O
expansion bus. Upon power-up, the RIO
will realize that the LOGIO is present, and
begin utilizing the added I/O.
This document explains the
hardware of the Remote Logic I/O PCB
(LOGIO) and how to utilize its I/O
capability.
HARDWARE DESCRIPTION
POWER REQUIREMENTS
The power connector on the RIO is
used to supply the RIO and the Remote I/O
PCBs with power. The RIO supplies power
to each of the Remote I/O PCBs through the
I/O expansion bus. The power require-
ments for each of the voltages connected to
the RIO, therefore, include the power drawn
by the RIO and the power drawn by each of
the Remote I/O PCBs.
In order to select a properly sized
power supply, the current (I) requirements
of the PCBs for each of the voltages must be
known. The I requirements for the LOGIO
are as follows:
I for +5 VDC = (I of LOGIO) + (I of external
loads)
= (436 mA) + (I of external
loads)
I for +15 VDC = (I of LOGIO) + (I of exter-
nal loads)
= (13 mA) + (I of external
loads)
I for -15 VDC = (I of LOGIO) + (I of external
loads)
= (13 mA) + (I of external
loads)
I for +24 VDC = (I of LOGIO) + (I of exter-
nal loads)
= (142 mA) + (I of external
loads)
I/O EXPANSION BUS
The I/O expansion bus connects the
RIO to Remote I/O PCBs through use of a
40 pin ribbon cable. The bus is intended to
be connected in a daisy chain style from
Remote I/O PCB to Remote I/O PCB,
originating from the RIO. There are two I/O
expansion bus connectors (J1-A and J1-B)
on the LOGIO that allow the LOGIO to be
added into a given system to meet specific
requirements. The intention of having two
connectors rather than one is to simplify the
making of the ribbon cables. Multiple
ribbon cables with one connector on each
end can interconnect an entire remote I/O
system rather than one complex cable with
many connectors.
The I/O expansion bus carries logic
level signals and power to the Remote I/O
PCBs. Care should be taken in the routing
of the cable in order to keep it away from
noise inducing circuitry. Furthermore, the
maximum I/O expansion bus length should
not exceed 10 feet.
3
RD 798-10