Device configuration
6.6 Configuring the operation of the CPU
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
171
Table 6- 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 555) and pulse gen-
erators (Page 492)
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 C
PU 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 87)
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 com-
ponents (SM, SB, CM, CP and CPU):
• Allow acceptable substitute
• Allow any substitute (default)
Each module internally contains substitution compatibility requirements based on the num-
ber of I/O, electrical compatibility, and other corresponding points of comparison. For exam-
ple, 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 (de-
fault: 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.
OBs should be interruptible
: Configures whether OB execution (for all OBs) in the CPU is
interruptible or non-interruptible (Page 105)
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" func-
tions (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
Multilingual support
Assigns a project language for the Web server to use for displaying diagnostic buffer entry
texts for each of the possible Web server user interface display languages.
Sets the read/write protection and passwords for accessing the CPU
Configuration control
Enables configuring a master device configuration that you can control for different actual
Connection resources
(Page 801)
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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