Siemens SIMATIC IM 151/CPU, Manual

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C-1
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Execution Times of the SFCs and SFBs
The CPU component of the IM 151/CPU provides you with different system
functions and system function blocks for program scanning and diagnostics, for
example. You can call these system functions/system function blocks in your user
program using the number of the SFC.
For a detailed description of all system functions/system function blocks, refer to
the reference manual
STEP 7 System and Standard Functions. This includes how
to call the system functions and which parameters you have to enter.
C.1 System Functions (SFCs)
SFC
No.
Name Description Execution
Time in
s
0 SET_CLK Sets the clock time 295
1 READ_CLK Reads the clock time 193
2 SET_RTM Sets the operating hours counter 62
3 CTRL_RTM Starts/stops the operating hours counter 57
4 READ_RTM Reads the operating hours counter 86
5 GADR_LGC Reads the free address of the channel x of the signal module
on module slot y.
148
6 RD_SINFO Read the start information of the current OB. 116
+3 per byte
7 DP_PRAL Triggers a process interrupt from the user program of the
CPU as DP slave through to DP master. 228
14 DPRD_DAT Reads consistent user data 141
+3 per byte
15 DPWR_DAT Writes consistent user data 143
17 ALARM_SQ Creates acknowledgeable, block-specific messages 252
18 ALARM_S Creates non-acknowledgeable, block-specific messages 248
19 ALARM_SC Determines the acknowledgment status of the last
ALARM_SQ arrived message 115
20 BLKMOV Copies variables of any type
Note: You can only use SFC20 for process-related DBs, i.e.
the ”Unlinked” check box in the object properties is not selec-
ted. Otherwise, you will receive the W#16#8092 error code
(=block is not process-related) as the RET_VAL. 84
+1.6 per byte
C