Installation Considerations And Preparations; Emc Directive Installation Considerations; Preparation - Siemens APACS+ Installation And Service Instruction

INSTALLATION

2.2 Installation Considerations and Preparations

Review sections 2.2.1 and 2.2.2 before beginning a Remote I/O Rack installation.

2.2.1 EMC Directive Installation Considerations

Some Remote I/O Rack installations require adherence to the European Union's Electromagnetic
Compatibility (EMC) Directive. Refer to the "Declaration of Conformity" statement at the back of this
document that lists the certificate number of the Technical Construction File issued to this product. Contact
Siemens Moore for additional information concerning EMC Directive installation.

2.2.2 Preparation

This section presents an overview of the steps to be performed before beginning a Remote I/O Rack
installation. The selection of I/O modules, enclosures, and other APACS+ and/or QUADLOG assemblies is
described in detail in other documents, and assistance is also available from your local Siemens Moore
Technical Information Center (TIC).
1. Determine the following:
1) The number and types of I/O modules needed and the need for redundancy
2) The overall scope of controller communications and the number of racks needed to accommodate
needed control and I/O modules. There are four types of racks available: UNIRAC (up to three
slots), Remote I/O Rack (four slots), SIXRAC (six slots), and MODULRAC (ten slots). Note the
following:
•
An IOBUS can support a maximum of 40 slots as described in section 1.1. The actual capacity
depends upon the type of rack used or the combination of racks and modules used. For example,
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 supports
only I/O modules, the associated control module must be located in another rack such a
SIXRAC.
•
While not directly affecting a Remote I/O Rack but important for system planning, a maximum
of 32 control modules can reside on a MODULBUS (M-BUS). Only MODULRACs and
SIXRACs support the MODULBUS. A MODULBUS can extend across a maximum of four
SIXRACs, or four MODULRACs, or a combination of both that equals four racks.
3) Determine the sum of the IOBUS cable lengths needed to interconnect one or more racks (Remote
I/O Racks, SIXRACs, MODULRACs, and UNIRACs). Refer to section 5 in this document for
maximum cable lengths.
2-2
SD39RIO-1
January 2001