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more information, refer to the section Parameter assignment and structure of the
parameter data records of the digital on-board I/O (Page 156))You can use technology and standard functions at the same time, provided the hardware
allows this. For example, all the digital inputs not assigned to the counting, measuring or
position detection or PTO technology functions can be used as standard DI.
Inputs to which technology functions are assigned can be read. Outputs to which technology
functions are assigned cannot be written.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). You can pull and plug the front panel with display during operation. The CPU retains its
operating mode when the front panel is pulled and plugged.
WARNING
Personal injury and damage to property may occur
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-energizedYou 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.n addition to the mechanical lock, you can also block access to a password-protected CPU
on the display (local lock) and assign a password for the display. For more information on
the display, the configurable protection levels and the local lock, refer to the , ET 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.

Number of free cycle OBs 100
• Number of time alarm OBs 20
• Number of delay alarm OBs 20
• Number of cyclic interrupt OBs 20; With minimum OB 3x cycle of 500 µs
• Number of process alarm OBs 50
• Number of DPV1 alarm OBs 3
• Number of isochronous mode OBs 1
• Number of technology synchronous alarm
OBs

Number of startup OBs32; A distributed I/O system is characterized not
only by the integration of distributed I/O via
PROFINET or PROFIBUS communication modules,
but also by the connection of I/O via AS-i
master modules or links (e.g. IE/PB-Link)
Number of DP masters
• Via CM 4; A maximum of 4 CMs/CPs (PROFIBUS,
PROFINET, Ethernet) can be inserted in total
Number of IO Controllers
• integrated 1
• Via CM 4; A maximum of 4 CMs/CPs (PROFIBUS,