Siemens SIMATIC S7-1200 Reference Manual

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Load objects to the CPU
The table shows which modifications and which modified blocks you can download in which operating mode.
Very complex programs can prevent downloading in RUN mode. Solution approaches:
• Use a memory card with sufficient capacity.
• Select a CPU with sufficient work memory.
• Reduce the number of modified used blocks, constants, PLC tags or data types.
You can find information about the behavior of the F-CPU for fail-safe blocks in the SIMATIC Safety – Configuring and
Programming manual.
Modifications and blocks S7-300 S7-400 S7-1200
V4.0 or
higher
S7-1500 S7-1200
V1.0 - 2.1
S7-1200
V2.2 - V3.0
Modified properties of hardware
components
STOP
STOP,
constraints in
RUN
STOP STOP STOP STOP
Added hardware components
STOP
STOP,
constraints in
RUN
STOP STOP STOP STOP
New/revised text lists
(alarms)
RUN RUN - RUN - -
Load number of blocks
RUN (<17) RUN (<57) RUN (<21) RUN STOP RUN (<11)
Reset work memory (MRES)
STOP
(Reset)
STOP
(Reset)
STOP
(Reset)
STOP
(Reset)
STOP
(Reset)
STOP
(Reset)
New OB
RUN RUN STOP RUN STOP STOP
Modified OB: Code modifications,
modification of comments
RUN RUN RUN RUN STOP RUN

Siemens SIMATIC S7-1200 Specifications

General

CPU Type	CPU 1211C, CPU 1212C, CPU 1214C, CPU 1215C, CPU 1217C
Communication	PROFINET
Analog Inputs	2
Analog Outputs	2
Power Supply	24V DC
Expansion Modules	Signal Modules (SM), Communication Modules (CM)
Programming Languages	LAD, FBD, SCL
Dimensions	90 mm x 100 mm x 75 mm
Program Memory	50 KB to 150 KB (depending on model)