Siemens SIMATIC S7-1200 Reference Manual page 66

Basic instructions
Instruction Operating
✔ ✔ ✔
GET
✔
GET_S
✔ ✔ ✔
PUT
✔
PUT_S
✔ ✔
BSEND/BRCV: RUN
✔ ✔
USEND/URCV
✔
USEND_S/
URCV_S
A5E33284667-AF
Extended instructions
Property of
state of
the data
partner
transfer
controller
RUN or Reliable with
STOP acknowledgme
nt
Fast, without
acknowledgme
nt
Technology
Guaranteed user Application
data size for
specified partner
controller
S7-300: 160 bytes Accessing data in the target
S7-400: 400 bytes controller without any
S7-1200: 160 bytes programming. For example, read
S7-1500: 880 bytes operating data.
Changing data in the target
controller without any
programming. For example, write
parameters in a data block and
change a recipe.
S7-300: 32768/ Exchange large amounts of data.
65534 bytes For example, send data block with
S7-400: 65534 bytes measured value logs to a SCADA
S7-1500: 65534 bytes, system for further evaluation.
optimized: 65535
bytes
S7-300: 160 bytes Control multiple controllers, or
S7-400: 440 bytes send data to multiple controllers.
S7-1500: 920 bytes For example, distribute actual
values of a sensor to several
controllers.
Communication
Notes
You have to use data
blocks with absolute
addressing. Symbolic
addressing is not
possible. You must also
enable this service in the
CPU configuration in the
"Protection" area
.
Coordinated transmission
(See above)
Uncoordinated
transmission
(See above)
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