Plug-in connection for power supply
③ Plug-in connection for backplane bus
④ Fastening screws
Figure 2-8 View of the CPU 1512C-1 PN - rearYou use the operating mode buttons to set the operating mode of the CPU.
The following table shows the meaning of the corresponding operation of the operating mode
buttons.
Table 2- 5 Meaning of the operating mode buttons
Operation of the operating mode buttons
Meaning Explanation
RUN RUN mode The CPU executes the user program.
STOP STOP mode The user program is not executed. (STOP
ACTIVE LED lights up).
MRES
1. Press the operating mode button
STOP.
Result: The RUN/STOP LED lights
up yellow.
2. Press the operating mode button
STOP until the RUN/STOP LED
lights up for the 2nd time and remains
continuously lit (this takes
three seconds). After this, release
the button.
3. Press the operating mode button
STOP again within the next three
seconds.
Manual memory reset
(with inserted SIMATIC
memory card)
or
Reset to factory settings
(without inserted SIMATIC
memory card):
The CPU executes memory reset.
or
The CPU is reset to its factory settings.
You can find additional information in the
/ET 200MP system manualPress the operating mode button
STOP until the RUN/STOP LED
lights up for the 2nd time and remains
continuously lit (this takes
three seconds). After this, release
the button.
3. Press the operating mode button
STOP again within the next three
secondsThe technology functions of the compact CPU have the following technical properties:
● 32 high-speed digital inputs (up to 100 kHz), isolated
– 6 high-speed counters (High Speed Counter/HSC), which can all be used as A/B/N
● Interfaces
– 24 V encoder signals of sourcing or push-pull encoders and sensors
– 24 V encoder supply output, short-circuit-proof
– Up to 2 additional digital inputs per high-speed counter for possible HSC DI functions
(Sync, Capture, Gate)
– 1 digital output per high-speed counter for fast reaction to the count
● Counting range: 32 bits
● Diagnostics and hardware interrupts can be configured
● Supported encoder/signal types
– 24 V incremental encoder
(with 2 tracks A and B, phase-shifted by 90°, up to 6 incremental encoders also with
zero track N)
– 24 V pulse encoder with direction signal
– 24 V pulse encoder without direction signal
– 24 V pulse encoder each for forward pulse & reverse pulse
The high-speed counters support reconfiguration in RUN. You can find additional information
in section Parameter data records of the high-speed counters (Page 180).Counting refers to the detection and adding up of events. The counters acquire and evaluate
encoder signals and pulses. You can specify the count direction using encoder or pulse
signals or through the user program.
You can control counting processes using the digital inputs. You can switch the digital
outputs exactly at defined count values, regardless of the user program.
You can configure the response of the counters using the functionalities described below.
Counting limits
The counting limits define the count value range used. The counting limits are selectable and
can be modified during runtime by the user program.
The highest counting limit that can be set is 2147483647 (231–1). The lowest counting limit
that can be set is –2147483648 (–231).
You can configure the response of the counter at the counting limits:
● Continue or stop counting (automatic gate stop) on violation of a counting limit
● Set count value to start value or to opposite counting limit on violation of a counting limit
Start value
You can configure a start value within the counting limits. The start value can