Siemens SIMATIC S7-1200 Series CPU — The Basic Controller – All in one! The new modular SIMATIC S7-1200 controller is at the core of our new offering for simple but highly precise automation tasks. The SIMATIC S7-1200 controller is modular and compact, versatile, a secure investment, and is perfectly suited to a whole range of applications. Setting up S7-1200/1500. This tutorial gives you step-by-step instructions on how to use a Siemens S7-1200/1500 PLC to control FACTORY I/O. Although the following instructions refer to an S7-1200 model, the same steps apply to the 1500. Setting up communication between PC and PLC.
Galvanic or optical isolation in I/O cards relates to the technology used to provide the isolation and changeover between the field and the PLC internal circuit. Field voltages are converted to internal TTL voltage (usually 5V DC) either by transformers (galvanic) or optocouplers (optical). This provides the isolation between field and the channel internal circuitry. The idea of any isolation remaining the same - to protect the circuit from problems externally.
As a end user it does not matter (to me) whether it is optical or galvanic as long as there is one of the two. The thing to remember, which not many people realise, is that isolation on I/O cards can be in 3 possibilites - channel to field, channel to channel and channel to ground. The more isolation you get from the manufacturer, the higher the price. Usually all manufacturers have various models to choose from for the same functionality but differing isolation capabilites. Hope the helps you in some way. This is the answer to this question I gave last August in regard to the definition of galvanic isolation is:'I'm not sure that there is a recognized definition for galvanic isolation in regards to electrical signals and circuits, but one definition might be:Galvanic Isolation - Electrical isolation of a type that no direct electrical connection exists between the two sides being isolated. Commonforms of galvanic isolation are optical and transformer.Some times the term 'physical barrier' is substituted for 'no direct electrical connection.'
An alternate definition which I have seen is:Galvanic Isolation - A means of interconnecting two circuits which prevents an unacceptable current from flowing as a result of potentialdifference (both AC and DC) between the circuits.Optical isolation uses light as the isolating means and converts the input signal to light and then converts the light back to the output signal. It is a form of galvanic isolation.' In regards to the usage of galvanic isolation or any isolation for that matter, isolation is generally used to isolate the detrimental effects of two different circuits being connected together. The most common reason isolation is used to prevent is a ground loop. Isolation is also sometimes used to prevent noise and surges from passing between circuits.
In some cases an isolating device become the 'fuse' to prevent damage to a more expensive device.In regards to usage with PLC I/O modules, it is again isolation between circuits. For four wire devices(analyzers, scales, etc) that sourcecurrent, isolation is required to isolate the signal/ground of the four wire device from the other circuits on the I/O module.Many people use isolated I/O modules as a matter of good engineering practice. Some of the reasons are future use of the I/O point is unknown, better isolation from noise and surges, less likely to have a ground loop by mistake, etc.Bill MostiaWilliam(Bill) L. PEPartnerexida.comExcellence in Dependable [email protected](b)[email protected](h)www.exida.com.
Galvanic isolation means Electrically isolated.Optically isolated means the galvanic (electrical) isolation is by optics. If you have a PLC output card with relay outputs and each relay output contact is wired to terminals, then the PLC internal circuit and relay contacts are Galvanically isolated.Optically isolated means the PLC internal circuit and external circuit components are coupled by OPTICAL isolation such as a LED/photo transistor or LED/Triac combinations. This is ANOTHER form of galvanic isolation.There are also i/o cards available that are galvanically or optically isolated (from PLC circuit) and galvanically isolated from one another (ex- a 2 channel 4-20 ma analog input card with optically isolated inputs and also galvanically isolated inputs) Hope this helps.sekar. You have clicked on the '?' Button for search help.
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By Hans BergerHans Berger has written a clear book based mostly on theory and operation of the Siemens S7-1200 PLC equipment, contrasting the original software user guide offered by Siemens. The SIMATIC S7-1200 PLC offers a modular design concept with similar functionality as the well-known S7-300 series. Being the follow-up generation of the SIMATIC S7-200 the controllers can be used in a versatile manner for small machines and small automation systems.As part of Totally Integrated Automation (TIA) Portal, the engineering software STEP 7 Basic offers a newly developed user interface, which is matched to intuitive operation. A profound introduction into STEP 7 Basic V11 illustrates the basics of programming and trouble shooting.
Beginners learn the basics of automation with SIMATIC S7-1200 and advanced users of S7-200 and S7-300 receive the knowledge required to work with the new PLC.This book clears up so much of the confusion that the original guide creates. All aspects and features of the S7-1200 system are covered, in-depth, by the author. My only reservation is that not enough practical examples are included. More real-world applications and examples would have easily enhanced this book. Fervent readers will find only barren examples of function block diagram (FBD), structured code language (SCL) and ladder logic (LAD) programming. Hopefully, other published books by Hans Berger have been embellished above this one.