Siemens SIMATIC S7-1200 - 13.3.3 Configuring the PtP Freeport communication

Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1093
Communication to a partner with the 3964(R) protocol
When you configure a CM for 3964(R) protocol, you use the standard point-to-point send
and receive instructions to transfer data between the CPU and its communication partner.
The CM embeds your data from the BUFFER parameter of the send instruction into the
3964(R) protocol and sends the data to the communication partner.
The CM receives data from the communication partner by means of the 3964(R) protocol,
removes the protocol information, and returns the data in the BUFFER parameter of the
receive instruction.
Refer to the following point-to-point instructions:
● Send_P2P (Transmit send buffer data) (Page 1122)
● Receive_P2P (Enable receive messages) (Page 1126)
You can also use the legacy point-to-point send and receive instructions:
● SEND_PTP (Transmit send buffer data) (Page 1226)
● RCV_PTP (Enable receive messages) (Page 1229)
13.3.3
Configuring the PtP Freeport communication
You can use either of the following methods to configure the communication interfaces for
PtP Freeport communication:
● Use the device configuration in STEP 7 to configure the port parameters (baud and
parity), the send parameters and the receive parameters. The CPU stores the device
configuration settings and applies the settings after a power cycle and a RUN to STOP
transition.
● Use the Port_Config (Page 1110), Send_Config (Page 1112), and Receive_Config
(Page 1115) instructions to set the parameters. The port settings set by the instructions
are valid while the CPU is in RUN mode. The port settings revert to the device
configuration settings after a STOP transition or power cycle.
After configuring the hardware devices (Page 153), you configure parameters for the
communication interfaces by selecting one of the CMs in your rack or the CB, if configured.
The "Properties" tab of the inspector window di
s-
plays the parameters
of the selected CM or CB.
Select "Port configuration" to edit the following
parameters:
•
Baud rate
•
Parity
•
Data bits per character
•
Number of stop bits
•
Flow control (RS232 only)
•
Wait time