Siemens Simatic ET200pro

Basics of program execution
5.3 Asynchronous instructions
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
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The table below shows the maximum number of simultaneously running jobs for
asynchronous instructions (communications processors) for the CPU.
Communications processors
CPU 1516pro-2 PN
PtP communication
Port_Config uses RDDEC, WRREC
Send_Config
uses RDDEC, WRREC
Receive_Config uses RDDEC, WRREC
Send_P2P
uses RDDEC, WRREC
Receive_P2P
uses RDDEC, WRREC
Receive_Reset
uses RDDEC, WRREC
Signal_Get
uses RDDEC, WRREC
Signal_Set
uses RDDEC, WRREC
Get_Features
uses RDDEC, WRREC
Set_Features
uses RDDEC, WRREC
USS communication
USS_Port_Scan
uses RDDEC, WRREC
MODBUS (RTU)
Modbus_Comm_Load
uses RDDEC, WRREC
ET 200S serial interface
S_USSI
uses CREATE_DB
SIMATIC NET CP
FTP_CMD
uses TSEND, TRCV, TCON, TDISCON