Calculating Power Needs - Siemens SIMATIC TI555 System Manual

2.1 Planning Your Installation
Defining Control
Calculating Power
Needs
Pre-installation Guidelines
2-2
Preparing the site for installation of your TI545/TI555 controller consists of
the following tasks.
Defining control requirements
Determining the number of controllers needed
Determining the panel and grounding layout
NOTE: Since no two applications are identical, use these recommendations
as general guidelines only.
Use the following steps 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 true 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
controller, 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 Series 505 module power consumption
information.
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. Refer to Chapter 3 for Series 505 power budget.
TI545/TI555 System Manual