Siemens SIMATIC S7-1500 System Manual page 48

Technology function of the onboard I/O
The eight digital input/outputs of the SIMATIC Drive Controller provide the following
technology function at the X142 interface:
Table 3- 7 Technology I/Os of the CPU at interface X142
Operating mode
DI
DQ
Timer DI
Timer DQ
Oversampling DI
Oversampling DQ
Event/period measurement
Pulse width modulation
(PWM)
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA
Function
Digital input
optional: Hardware interrupt upon rising
and/or falling edge
Digital output
Acquisition of the switching time of a digital
input signal with up to two edges per cycle
(OB91/OB6x)
Precise output of a digital output signal with
up to two edges per cycle (OB91/OB6x)
Acquisition of 32 states of a digital input
signal at equal intervals per cycle
(OB91/OB6x)
Output of 32 states for a digital output signal
at equal intervals per cycle (OB91/OB6x)
Measurement of number of edges and period
max. counting frequency 32 kHz
Output of a selectable pulse-pause ratio with
a configurable base frequency of: 1 kHz,
2 kHz, 4 kHz, 8 kHz, 16 kHz
3.3 SIMATIC Drive Controller functions
Application
Used as hardware limit switch, for example
Used to control an indicator light, for exam-
ple
Used as the input of a measuring input, for
example
Used as an output cam output, for example
Detection of short signal levels that are
shorter than the position control cycle or
isochronous mode interrupts.
Used, for example, to detect a fast-traveling
product with a proximity switch or light bar-
rier
Output of short signal levels that are shorter
than the position control cycle or isochro-
nous mode interrupts.
Used, for example, to control the output of
short pulses or pulse trains, for example to
control a glue valve for applying dots of
glue.
Simple speed measurement with shadow
mask and light barrier
Period measurement
Counter (rising edges)
Output of a signal with a defined period and
variable on-load factor
Used, for example, to control proportional
valves and directional valves (energy sav-
ings through reduction in holding current).
System overview
47