Programs running on Simatic devices run in software environments created by Siemens. These models were later succeeded by the S7-1200 and S7-1500 series. The first entries in the S7 line were the S7-200, S7-300 and S7-400 series. Available options included serial and Ethernet communications, digital input and output cards,analog signal processingboards, counter cards, and other specialized interface and function modules. Some systems provided redundant CPU operation for ultra-high-reliability control, as used inpharmaceuticalmanufacturing, for example.Įach chassis consisted of apower supply, and a backplane with slots for the addition of various option boards. Within each chassis style, severalCPUswere available, with varying speed, memory, and capabilities.

The higher the number (except for the 101U), the more sophisticated and more expensive the system was. Siemens has developed four product lines to date:1958: Simatic Version G1973: Simatic S31979: Simatic S51995: Simatic S7 Simatic S5 For example, the Simatic 505 could handle floating point quantities and trigonometric functions. More complex inputs, outputs, and calculations were also supported as the Simatic line developed. For example, a binary input going from a thermometer on a machine to a Simatic device might have the following meanings:“High” signal: Temperature exceeded an operating limit“Low” signal: Temperature is within expected limitsīased on this input, and other factors, the program on the Simatic device might send a binary output signal to the same machine with the following meanings:“High” signal: Run the motor“Low” signal: Stop the motor The programs on the Simatic devices respond inreal timeto inputs fromsensorson the controlled machines, and send output signals toactuatorson the machines that directing their subsequent operation.ĭepending on the device and its connection modules, signals may be a simple binary value ('high' or 'low') or more complex. Microprocessors were introduced in 1973, allowing programs similar to those on general-purpose digital computers to be stored and used for machine control.Simatic devices have input and output modules to connect with controlled machines. Early Simatic devices were transistor-based, intended to replace relays attached and customized to a specific machine.

Siemens Simatic S7-300 PLC CPU with three I/O modules attachedĪs with otherprogrammable logic controllers, Simatic devices are intended to separate the control of a machine from the machine's direct operation, in a more lightweight and versatile manner than controls hard-wired for a specific machine.

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