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Pre-installation Guidelines SIMATIC 545/555/575 System Manual

2.1 Planning Your Installation

Preparing the site for installation of your CPU consists of the following

tasks:

• Define control requirements.

• Determine the number of CPUs needed.

• Determine the panel and grounding layout.

NOTE: Since no two applications are identical, use these recommendations

as general guidelines only.

Use the following considerations to define your control requirements:

• Define the number and type of inputs and outputs you need.

• Calculate the number of I/O modules and bases that you need.

• Determine the power requirements and mounting space needed.

• Consider availability of space (including growth potential). This is

particularly vital if several double-wide modules are needed.

Calculate a power budget for each base prior to installation. The power

requirements of all modules must be included in the calculations—the CPUs

and the base controllers, as well as the I/O modules. The user-supplied

power to individual modules is not a part of the power budget calculation.

Refer to Appendix B for information about Series 505 and 575 VME module

and annex card power consumption.

To help ensure reliable system operation, the total power required for the

controller and I/O modules must not exceed the total power available from

the system power supply. Chapter 3 gives information about Series 505

power supplies; Chapter 4 describes VME power supplies.

For the 575, if a given module exceeds 3.3 amps in the VMEbus backplane,

then a J2 connector (PPX:2589739–8012) must be installed in that slot.

(This assumes that the module has a P2 connector.)

Defining Control

Requirements

Calculating Power

Needs

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Siemens SIMATIC TI500 Especificaciones Pagina 37