Product overview
3.2 How it works
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC
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3.2 How it works
The CPU contains the operating system and executes the user program. The user program
is located on the SIMATIC memory card and runs in the work memory of the CPU.
The PROFINET interfaces on the CPU allow simultaneous communication with:
● PROFINET devices
● PROFINET controllers
● HMI devices
● Programming devices
● Other controllers and other systems
The CPU 1516pro-2 PN supports the (simultaneous) operation as an IO controller and
I-device.
IO controller
As an IO controller, the CPU 1516pro-2 PN sends and receives data from the connected IO
devices within a PROFINET IO system. You can operate the following IO devices on the
PROFINET interfaces of the CPU:
1st PROFINET interface (X1): maximum of 256 IO devices, of which a maximum of 64 in IRT
(Isochronous real-time).
2nd PROFINET interface (X2): maximum of 32 PROFINET devices
I-device
The "I-device" (intelligent IO device) functionality allows you to exchange data with an IO
controller. The CPU 1516pro-2 PN thus fulfills the role of an intelligent distributed pre-
processing unit of sub-processes. The I-device is connected to a "higher-level" IO controller
as an IO device.
Advantages:
● Interference-resistant configuration due to short signal and encoder wiring
● Reduced wiring effort for transmission of data via PROFINET
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