
INTRODUCTION SD39RIO-1
January 2001
1-2
The rack is flanged for flush mounting on a flat surface such as a wall or instrument panel. The rack can also
be mounted on a flat panel inside a Siemens Moore MODULPAC enclosure, or on a flat panel within a third-
party enclosure.
Each module in the Remote I/O Rack connects to its I/O field wiring via an Interconnect I/O Cable Assembly.
Each cable extends from a module’s slot position in the rack to a companion marshalled termination assembly
that provides I/O field terminals. Installation of these cable assemblies is commonly performed at the time of
rack installation.
The Remote I/O Rack can function as a four-module I/O subsystem or it can be used to extend the I/O
module capacity of a SIXRAC from six to ten modules.
Since the Remote I/O Rack is intended for I/O modules, it must be connected to a control resource such as a
control module [e.g., Advanced Control Module (ACM)] to form a controller. This connection is made over
the IOBUS (detailed below). In this document, the term “controller” refers to a control resource plus its
associated I/O modules.
When an I/O module is inserted into a slot of the Remote I/O Rack, it becomes a node on the following buses:
•
IOBUS
– A redundant (A and B) serial bus with a 1 Mbps data transmission rate that provides a control
module with dedicated, secure access to field I/O points via I/O modules. Generally, an IOBUS can span
a maximum of 40 slots consisting of any combination of Remote I/O Racks (4 slots), SIXRACs (6 slots),
MODULRACs (10 slots), and UNIRACs (1 slot). These racks are interconnected serially with IOBUS A
and B cables. Note that each control module (ACM, CCM), Bus Continuation Module (BCM), Bus
Diverter Module (BDM), and each empty slot counts as a slot.
Two removable dual-function (Bus Terminate or Bus Continue) IOBUS Shunts are provided for easy set-
up for either end-of-bus termination or bus-continuation to other racks in the chain. The Remote I/O
Rack provides one continuous IOBUS segment (four nodes).
An attenuator is supplied with each Remote I/O Rack. When an IOBUS extends 30 meters or longer,
attenuation is required to protect against signal reflections in the event one side of the IOBUS (A or B) is
inadvertently disconnected or severed.
•
Power Bus
– A triple bus that supplies 24 Vdc operating power to I/O modules from up to three
independent power sources. Each power source is applied to the Power Bus via a plug-in cable from an
externally mounted power supply, such as POWERAC.
The Remote I/O Rack’s backplane contains DC power bus connectors. It also contains the IOBUS connectors
to expand the IOBUS to additional racks if required.
A thumbwheel switch on the backplane is used to assign a Remote I/O Rack address (1 to16) for software
identification of I/O modules in communications throughout the system.
A slot address range slide switch on the backplane is used to set whether the Remote I/O Rack is to occupy
lower slot addresses (1 to 4) for standalone use, or upper slot addresses (7 to 10) when used as an extension
to another rack such as a SIXRAC.
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Страница 25: ...SD39RIO 1 INSTALLATION January 2001 2 13 Figure 2 8 IOBUS Connections MODULRAC to Remote I O Rack ...
Страница 29: ...SD39RIO 1 INSTALLATION January 2001 2 17 Figure 2 11 W2072 Cable End Preparation ...
Страница 34: ...INSTALLATION SD39RIO 1 January 2001 2 22 Figure 2 14 W2040 Cable End Preparation ...
Страница 39: ...SD39RIO 1 INSTALLATION January 2001 2 27 Figure 2 17 Belden 8627 Cable End Preparation ...
Страница 54: ...INSTALLATION SD39RIO 1 January 2001 2 42 Figure 2 31 Rack and I O Module Keying ...
Страница 64: ...SPECIFICATIONS SD39RIO 1 January 2001 6 4 ...
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