Ppi Protocol - Siemens SIMATIC S7 System Manual

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PPI protocol

PPI is a master-slave protocol: the master devices send requests to the slave devices, and

the slave devices respond. See the following figure. Slave devices do not initiate messages,

but wait until a master sends them a request or polls them for a response.

Masters communicate to slaves by means of a shared connection which is managed by the

PPI protocol. PPI does not limit the number of masters that can communicate with any one

slave; however, you cannot install more than 32 masters on the network.

PPI protocol and S7-200 SMART CPUs

PPI Advanced allows network devices to establish a logical connection between the devices.

With PPI Advanced, there are a limited number of connections supplied by each device. See

the following table for the number of connections supported by the S7-200 SMART CPU.

All S7-200 SMART CPUs support both PPI and PPI Advanced protocols.

RS485/RS232 signal board

The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s do not support

the use of expansion modules or signal boards.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

Number of connections for the S7-200 SMART CPU

9.6 Kbps, 19.2 Kbps, or 187.5 Kbps

Communication

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Simatic s7-200 smart