Siemens SIMATIC S7-1200 Manual page 47

The CPU performs a warm restart before going to RUN mode. Warm restart resets all non-
retentive memory to the default start values, but the CPU retains the current values stored in
the retentive memory.
Note
The CPU always performs a cold restart after a download
Whenever you download an element of your project (such as a program block, data block, or
hardware configuration), the CPU performs a cold restart on the next transition to RUN
mode. In addition to clearing the inputs, initializing the outputs and clearing the non-retentive
memory the cold restart also clears the retentive memory areas.
After the cold restart that follows a download, all subsequent STOP-to-RUN transitions
perform a warm restart (that does not clear the retentive memory).
Configuring the operation of the I/O and communication modules
To configure the operational parameters for the signal module (SM), signal board (SB), or
communication module (CM), select the module in the Device view and use the "Properties"
tab of the inspector window.
Signal module (SM) and signal board (SB)
• Digital I/O: Configure the individual inputs, such as
• Analog I/O: Configure the parameters for individual inputs (such as voltage / current,
• Diagnostic addresses: Configure the start address for the set of inputs and outputs of
Communication module (CM)
• Port configuration: Configure the communication
• Transmit and receive message: Configure options
You can also change these configuration parameters with your user program.
Easy Book
Manual, 11/2009, A5E02486774-01
for Edge detection and "pulse catch" (to stay on
after a momentary pulse). Configure the outputs to
use a freeze or substitute value on a transition from
RUN mode to STOP mode.
range and smoothing) and also enables underflow or overflow diagnostics. Configure
the parameters for individual analog outputs and enables diagnostics, such as short-
circuit (for voltage outputs) or overflow values.
the module.
parameters, such as baud rate, parity, data bits,
stop bits, and wait time
related to transmitting and receiving data (such as
the message-start and message-end parameters)
Programming concepts made easy
5.1 Easy to create the device configuration
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