FAQ
As we work with engineers to solve their control and automation problems, we find they ask many of the same questions. Below is a list of the answers to the most commonly asked questions concerning PLCs, Programmable Relays, and their implementation.
When do I need a Programmable Relay?
If you are currently using or in need of any of the following you should consider using a Programmable Relay:
When do I need a PLC?
If you are currently using, or in need of, any of the following you should consider a PLC:
5-7 relays
3-4 programmable relays
Networking to an operator interface
Any number of analog input or output devices
Global Support for your system
Flexibility to change machine logic between machines or on the fly
Remote monitoring and troubleshooting
What benefits can programmable devices bring to my application?
Flexibility of control - each machine can be programmed for it's own need
Ease of troubleshooting compared to wiring of relays
Less moving parts = longer life
Devices with networking capabilities can be troubleshot from a distance
Lower costs - even if the device costs more, most users find the installation and troubleshooting savings far outruns any added cost of hardware
Where do I purchase one?
Siemens has an extensive distributor network. This network of distributors is trained and inventories products to support their local customers. To find your local distributor please click here.
How do I learn how to program one?
You have many options to learn how to set up your system. From online guides and product training to classroom training. Click here to learn more.
Many engineers are also interested in just trying one out. To learn how you can try one before you buy it click here.
Is there support around the nation and the world if I run into questions?
As the #1 supplier of small PLC's in North America and around the world, Siemens offers both Distributor and in house support. Click here to learn more about the support options available to you. You can find the help you need by clicking here.
Where can I find more information on S7-200 PLCs, LOGO! Programmable Relays and SITOP Power Supplies?
To access additional information such as Test Certificates, Deep Technical Data, Approval Certificates and more, please click on the links below.