Device configuration
5.5 Configuring the operation of the CPU
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
143
Table 5- 2 CPU properties
Sets the IP address for the CPU and time synchronization
DI, DO, and AI Configures the behavior of the local (on-board) digital and analog I/O (for example, digital
input filter times and digital output reaction to a CPU stop).
High-speed counters
(Page 409) and pulse
generators (Page 365)
Enables and configures the high-speed counters (HSC) and the pulse generators used for
pulse-train operations (PTO) and pulse-width modulation (PWM)
When you configure the outputs of the CPU or signal board as pulse generators (for use with
the PWM or motion control instructions), the corresponding output addresses are removed
from the Q memory and cannot be used for other purposes in your user program. If your
user program writes a value to an output used as a pulse generator, the CPU does not write
that value to the physical output.
Startup (Page 81)
Selects the behavior of the CPU following an off-to-on transition,
such as to start in STOP mode or to go to RUN mode after a warm restart
Supported hardware compatibility:
Configures the substitution strategy for all system
components (SM, SB, CM, CP and CPU):
• Allow acceptable substitute
• Allow any substitute (default)
Each module internally contains substitution compatibility requirements based on the
number of I/O, electrical compatibility, and other corresponding points of comparison. For
example, a 16-channel SM could be an acceptable substitute for an 8-channel SM, but an 8-
channel SM could not be an acceptable substitute for a 16-channel SM. If you select "Allow
acceptable substitute", STEP 7 enforces the substitution rules; otherwise, STEP 7 allows
Parameter assignment time for distributed I/O:
Configures a maximum amount of time
(default: 60000 ms) for the distributed I/O to be brought online. (The CMs and CPs receive
power and communication parameters from the CPU during startup. This assignment time
allows time for the I/O connected to the CM or CP to be brought online.)
The CPU goes to RUN as soon as the distributed I/O is online, regardless of the assignment
time. If the distributed I/O has not been brought online within this time, the CPU still goes to
RUN--without the distributed I/O.
If your configuration uses a CM 1243-
5 (PROFIBUS master), do not set this parameter
below 15 seconds (15000 ms) to ensure that the module can be brought online.
Defines a maximum cycle time or a fixed minimum cycle time
Allocates a percentage of the CPU time to be dedicated to communication tasks
System and clock memory
Enables a byte for "system memory" functions and enables a byte for "clock memory"
functions (where each bit toggles on and off at a predefined frequency).
Enables and configures the Web server feature.
Selects the time zone and configures daylight saving time
User interface languages Selects a language for Web server and CPU display corresponding to the project language.
For up to two project languages, you can
assign a corresponding user interface language for
Web server and CPU display.
Sets the read/write protection and passwords for accessing the CPU
Connection resources
Provides a summary of the communication connection resources that are available for the
CPU and the number of connection resources that have been configured.
Provides a summary of the I/O addresses that have been configured for the CPU.
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