Dfb_Sample - Delta Standard AX Series Instruction Manual

AX Seri es-St andard I nst ruct i ons Manual

3.6 DFB_Sample

Supported Products
•
AX-308E, AX-364E, AX-324N

DFB_Sample is the application function block for high-speed counters, its role is to read the increasing and decreasing number
of the counter value during the sampling period.
FB/FC Instruction
FB DFB_Sample
Input
•
Name
instruction when
bEnable
bEnable changes
Sampling period
wSampleTime
Output
•
Name
bValid
bBusy
bError
ErrorID
diSampleValue
*Note: DFB_HSIO_ERROR: Enumeration (Enum)
Function Data Type
Execute the
to True.
(Unit: 1ms)
Function
True when the output value is
valid.
True when the instruction is
enabled.
True if an error occurs.
Indicates the error code if an error
occurs.
Increasing number of the counter
value during each sampling
period.
Graphic Expression
Setting Value
(Default value)
BOOL
WORD
Data Type
DFB_HSIO_ERROR*
DFB_Sample_instance(
diSampleValue =>);
True/False
(False)
10～65535
(0)
Output Range(Default value)
BOOL
BOOL
BOOL
DFB_HSIO_ERROR
(DFB_HSIO_NO_ERR)
Positive number, negative
DINT
Chapt er 4
ST Language
Counter :=,
bEnable :=,
wSampleTime :=,
bValid =>,
bBusy =>,
bError =>,
ErrorID =>
Timing for Updating
-
When bEnable shifts to
True and bBusy is False
True/False(False)
True/False(False)
True/False(False)
number or 0(0)
5 4