Siemens S7-200

Siemens LOGO! PLC

What is LOGO! ?

LOGO! is the universal logic module from Siemens.
LOGO! integrates-

• Control functions
• An operating and display unit
• Power supply
• An interface for program modules and a PC cable
• Ready-to-use basic functions that are often required in
• day-to-day operation, such as functions for on/off delays
• and current impulse relays
• Time switch
• Binary markers
• Inputs and outputs according to the device type

What devices are available?

LOGO! is available with 12 V, 24 V and 230 V for the fol-
lowing variants:

• Standard variant with 6 inputs and 4 outputs with di-
• mensions of 72 x 90 x 55 mm
• Variant without display with 6 inputs and 4 outputs with
• dimensions of 72 x 90 x 55 mm
• Long variant with 12 inputs and 8 outputs with dimen-
• sions of 126 x 90 x 55 mm

• Bus variant with 12 inputs and 8 outputs, and additional  AS interface bus connection, via which 4 further inputs and 4 further outputs are available in the bus system .And all this packed into dimensions of  126 x 90 x 55 mm.All variants include 19 ready-to-use basic and special func-tions for program creation.

Variants:

The following different variants of LOGO! are available:

Symbol Designation Supply voltage Inputs Outputs LOGO! 12/24RC 12/24 V DC 8 4 relays LOGO! 24 24 V DC 8 4 solid state 24V LOGO! 24C 24 V DC 8 4 solid state 24V LOGO! 24RC 24 V AC/DC 8 4 relays LOGO! 230RC 115...240 V AC/DC 8 4 relays LOGO! 12/24RCo 12/24 V DC 8 4 relays LOGO! 230RCo 115...240 V AC/DC   8 4 relays

Some useful educational ppts for LOGO! PLC , download from here:

LOGO! PLC Educational Slides(ppts)

Some Pictures for Siemens Overview

 Siemens PLCs are divided in these categories:

>> LOGO PLC

>> S7-200

>> S7-1200

>>S7-300

>>S7-1500

>>S7-400

>>S7-400H

>>ET 200S

What is PLC???

A Programmable Logic Controller i.e PLC or Programmable Controller is like industrial computer

which perform very important role now a days. For easy understanding you can compare it with a human body, for example if some one asks you to change the position of your tv, how you will work?? first you will notice the present position and required position of TV , then you will stand up and will complete the action .
Similarly if you want to do it with PLC , then PLC should know both positions of TV using proximity sensor(input) and a motorized arm for movement (o/p) and in which way operation will carried out will be done via a logic or program like human mind.
Present time , there are several PLC available world wide , some of them are-

• Siemens 
• Allen Bradely
• Omron
• Mitubishi 
• Schneider
• GE Fanuc
• L&T

Some of interesting videos are :(from youtube.com)