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unctions are assigned cannot be written.LEDs for the current operating mode and diagnostics status of the CPU
② Status and error displays RUN/ERROR of the analog on-board I/O
③ Status and error displays RUN/ERROR of the digital on-board I/O
④ Control keys
⑤ Display
Figure 2-4 View of the CPU 1511C-1 PN with closed front panels (front)
Note
Temperature range for display
To increase its service life, the display switches off at a temperature below the permitted
operating temperature of the device. When the display cools down again, it automatically
switches itself on again. When the display is switched off, the LEDs continue to show the
status of the CPU.
You can find additional information on the temperatures at which the display switches itself
on and off in the Technical specifications (Page 125). If you pull or plug the front panel of an automation system during operation,
personal injury or damage to property can occur in zone 2 hazardous areas.
Before you pull or plug the front panel in hazardous area zone 2, always ensure that the
automation system is de-energized.
Locking the front panel
You can lock the front panel to protect your CPU against unauthorized access.
You can attach a security seal or a padlock with a hoop diameter of 3 mm to the front panel.You will find detailed information on the individual display options, a training course and a
simulation of the available menu commands in the SIMATIC Display Simulator The following figure shows the operator control and connection elements of the
CPU 1511C-1 PN with the front cover of the CPU open.LEDs for the current operating mode and diagnostics status of the CPU
② Status and error displays RUN/ERROR of the analog on-board I/O
③ Status and error displays RUN/ERROR of the digital on-board I/O
④ Fastening screw
⑤ Connection for supply voltage
⑥ PROFINET interface (X1) with 2 ports (X1 P1 and X1 P2)
⑦ MAC address
⑧ LEDs for the 2 ports (X1 P1 and X1 P2) of the PROFINET interface X1
⑨ Mode selector
⑩ Slot for the SIMATIC memory card
⑪ Display connection
Figure 2-6 View of the CPU 1511C-1 PN without front panel on the CPU (front)The technology functions of the compact CPU have the following technical properties:
● 16 high-speed digital inputs (up to 100 kHz), isolated
– 6 high-speed counters (High Speed Counter/HSC), 4 of which can 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 4 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 159).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 suitable 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 be modified
during runtime by the user program.
Depending on the parameter assignment, the compact CPU can set the current count value
to the start value during synchronization, during the Capture function, on violation of a
counting limit or when the gate is opened.