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Additional info for Basics of PLCs (SIMATIC S7-200)

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M OL T1 M OL T2 L1 L2 M L3 Stop Motor OL T3 Start OL M Ma Momentarily depressing the Start pushbutton completes the path of current flow and energizes the motor starter (M). 52 This closes the associated M and Ma (auxiliary contact located in the motor starter) contacts. When the Start button is released a holding circuit exists to the M contactor through the auxiliary contacts Ma. The motor will run until the normally closed Stop button is depressed, or the overload relay opens the OL contacts, breaking the path of current flow to the motor starter and opening the associated M and Ma contacts.

Standard instructions include; timer, counter, math, logical, increment/decrement/invert, move, and block instructions. Special instructions Special instructions are used to manipulate data. Special instructions include shift, table, find, conversion, for/next, and real-time instructions. High-speed instructions High-speed instructions allow for events and interrupts to occur independent of the PLC scan time. These include high-speed counters, interrupts, output, and transmit instructions. It is not the purpose of this text to explain all of the instructions and capabilities.

31 Expansion modules The S7-200 PLCs are expandable. Expansion modules contain additional inputs and outputs. These are connected to the base unit using a ribbon connector. The ribbon connector is protected by a cover on the base unit. Side-by-side mounting completely encloses and protects the ribbon connector. 32 Available expansion The S7-221 comes with 6 digital inputs and 4 digital outputs. These are not expandable. The S7-222 comes with 8 digital inputs and 6 digital outputs. The 222 will accept up to 2 expansion modules.

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