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measurement and position detection function manual The following measuring functions are available:
Table 3- 1 Overview of available measuring functions
Measurement type Descrtion
Frequency measurement
A measuring interval calculates the average frequency based on the time sequence of the count
pulses, and returns this frequency as a floating-point number in units of hertz.
Period measurement A measuring interval calculates the average period duration based on the time sequence of the
count pulses, and returns this period duration as a floating-point number in units of seconds.
Velocity measurement A measuring interval calculates the average velocity based on the time sequence of the count
pulses, and returns this velocity in the configured unit.
The measured value and count value are both available in the feedback interface.
Update time
You can configure the interval at which the compact CPU updates the measured values
cyclically as the update time. Greater update times smooth uneven measured variables and
increase the measuring accuracy.
Gate control
Opening and closing the hardware gate and software gate defines the period of time during
which the count signals are acquired. The update time is asynchronous to the opening of the
gate, which means that the update time is not started when the gate is opened. After the
gate is closed, the last measured value calculated is still returned.All measured values are returned as signed values. The sign indicates whether the count
value increased or decreased during the relevant time period. For example, a value of -
80 Hz means that the count value decreases at 80 Hz.
Reference
For more information on measuring, refer to the , ET 200MP, ET 200SP Counting,
measurement and position detection function manual You can use the digital on-board I/O, e.g. with an incremental encoder, for position detection
with Motion Control. The position detection is based on the counting function, which
evaluates the acquired encoder signals and provides them for Motion Control.
In the hardware configuration of the CPU 1511C-1 PN in STEP 7 (TIA Portal), select the
"Position input for Motion Control" mode.
Reference
For a detailed descrtion of the use of motion control and its configuration, refer to the
Motion Control function manual In the function manual, the
interface between the drives and encoders is referred to as a technology module (TM). In
this context, a technology module (TM) also refers to the digital on-board I/O of the compact
CPU described here.You can configure an external reference signal edge to load the counter with the specified
start value. The following external signals can trigger a synchronization:
● Rising or falling edge of a digital input
● Rising edge of signal N at the encoder input
● Rising edge of signal N at the encoder input depending on the level of the assigned digital
input
Comparison values
The integrated counter supports 2 comparison values and digital output HSC DQ1. If the
counter or measured value meets the set comparison condition, HSC DQ1 can be set in
order to trigger direct control operations in the process.
Both comparison values can be set in the parameters and can be changed during runtime
via the user program.
Hardware interrupts
If you have enabled a hardware interrupt in the hardware configuration, the counter can
trigger a hardware interrupt in the CPU when a comparison event occurs, if there is overflow
or underflow, at a zero crossing of the counter, and/or at a change of count direction
(direction reversal). You can specify which events are to trigger a hardware interrupt during
operation in the hardware configuration.
Diagnostics interrupts
If you have enabled a diagnostics interrupt in the hardware configuration, the counter can
trigger a diagnostics interrupt if the supply voltage is missing, if there is an incorrect A/B
count signal or lost hardware interrupt.n the STEP 7 online help under "Using technology functions > Counting, measuring and
position detection > Counting, measuring and position detection ()"
A detailed descrtion of configuring Motion Control be found in:The user program uses the control interface to influence the behavior of the high speed
counter.
Note
Operation with High_Speed_Counter technology object
The High_Speed_Counter technology object is available for high-speed counting mode. We
therefore recommend use of the High_Speed_Counter technology object instead of the
control interface/feedback interface for controlling the high speed counter.
For information on configuring the technology object and programming the associated
instruction, refer to the , ET 200MP, ET 200SP Counting, measurement and position
detection The user program receives current values and status information from the high speed
counter via the feedback interface.
Note
Operation with High_Speed_Counter technology object
The High_Speed_Counter technology object is available for high-speed counting mode. We
therefore recommend use of the High_Speed_Counter technology object instead of the
control interface/feedback interface for controlling the high speed counter.
For information on configuring the technology object and programming the associated
instruction, refer to the , ET 200MP, ET 200SP Counting, measurement and positioWith pulse width modulation, a signal with defined cycle duration and variable on-load factor