value. The axis is synchronized to the master axis
position.
? External encoder for detecting the actual position of
an encoder and its use as a master value for synchronous
operation
? Cams, cam track for position-dependent generation
of switching signals
? Measuring input for fast, accurate and eventdependent
sensing of actual positionsID Compact (continuous PID controller)
? PID 3Step (step controller for integrating actuators)
? PID Temp (temperature controller for heating and
cooling with two separate actuators)The know-how protection protects user blocks against
unauthorized access and modifications.
Copy protection links user blocks to the serial number
of the SIMATIC memory card or to the serial number of
the CPU. User programs cannot run without the corresponding
SIMATIC memory card or CPU.
Access protection You can use authorization levels to assign separate
rights to different users.
Integrity protection The CPUs dispose of integrity protection by default.
Integrity protection identifies possible manipulations of
engineering data on the SIMATIC memory card or
during data transfer between TIA Portal and CPU.
Integrity protection also checks the communication
from a SIMATIC HMI system to the CPU for possible
manipulations of engineering data.
If integrity protection identifies the manipulation of engineering
data, the user receives a corresponding message.
Password provider As an alternative to manual password input you can
connect a password provider to STEP 7. A password
provider offers the following advantages:
? Convenient handling of passwords. STEP 7 reads
the password automatically for the blocks. This
saves you time.
? Optimum block protection because the users do not
know the password itselfA CPU processes information exclusively in digital
format. An ADC (analog-to-digital converter) integrated
into the analog on-board I/O module therefore converts
the analog value into a bit pattern. For the CPU, this
conversion always returns a 16-bit word for SIMATIC
products. The ADC used digitalizes the analog signal
and approximates its value with a stepped curve. The
resolution specifies the number of increments of the
analog value along this stepped curve hereuring
Controllers are only capable of processing analog values
in the form of bit patterns. For this purpose, transducers
which can be connected to the analog module
measure physical variables such as pressure or temperature.
This analog value is measured by the analog
input module in the form of the measurement types
current, voltage or resistance. The analog on-board I/O
module supports the following measurement types on
the following channels.
? Voltage measurement type can be set individually
for channel 0 to 3