Siemens Simatic S7 Series

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Power Sources Depending on the CPU model, an S7-200 CPU is powered from
either a 24 VDC or a 120 to 240 VAC power supply. For example,
an CPU 221 DC/DC/DC model is powered from a 24 VDC power
supply and a CPU 222 AC/DC/Relay model is powered from a
120 or 240 VAC power supply.
AC Voltage Source
120 to 240 VAC
(Nominal Voltage)
DC Voltage Source
24 VDC
(Nominal Voltage)
Mode Switch and Analog Each S7-200 CPU has a mode switch with three positions,
Adjustment RUN, STOP, and TERM. When the mode switch is in the
RUN position, the CPU is in the RUN mode and executing the
program, unless a fault has occurred. When the mode switch
is in the STOP position, the CPU is in the STOP mode and
not executing the user program. When the mode switch is in
the TERM position, the programming device can select the
operating mode.
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