Siemens SIMATIC S7-1200, Системное руководство

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S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
315
Technology instructions
9
9.1 High-speed counter
Table 9- 1 CTRL_HSC instruction
LAD / FBD SCL Description
"CTRL_HSC_0_DB" (
hsc:=_hw_hsc_in_,
dir:=_bool_in_,
cv:=_bool_in_,
rv:=_bool_in_,
period:=_bool_in_,
new_dir:=_int_in_,
new_cv:=_int_in_,
new_rv:=_dint_in_,
new_period:=_int_in_,
busy:=_bool_out_,
status:=_word_out_);
Each CTRL_HSC instruction uses a structure stored in
a DB to maintain data. You assign the DB when the
CTRL_HSC instruction is placed in the editor.
1
STEP 7 automatically creates the DB when you insert the instruction.
2
In the SCL example, "CTRL_HSC_0_DB" is the name of the instance DB.
Table 9- 2 Data types for the parameters
Parameter and type Data type Description
HSC IN HW_HSC HSC identifier
DIR
1, 2
IN Bool 1 = Request new direction
CV
1
IN Bool 1 = Request to set new counter value
RV
1
IN Bool 1= Request to set new reference value
PERIOD
1
IN Bool 1 = Request to set new period value
(only for frequency measurement mode)
NEW_DIR IN Int New direction: 1= forward, -1= backward
NEW_CV IN DInt New counter value
NEW_RV IN DInt New reference value
NEW_PERIOD IN Int New period value in seconds: 0.01, 0.1, or 1
(only for frequency measurement mode)
BUSY
3
OUT Bool Function is busy
STATUS OUT Word Execution condition code
1
If an update of a parameter value is not requested, then the corresponding input values are ignored.
2
The DIR parameter is only valid if the configured counting direction is set to "User program (internal direction control)".
You determine how to use this parameter in the HSC device configuration.
3
For an HSC on the CPU or on the SB, the BUSY parameter always has a value of 0.