Siemens Simatic ET200pro

Basics of program execution
5.3 Asynchronous instructions
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
56 Operating Instructions, 09/2016, A5E35873416-AA
Basic instructions: maximum number of simultaneously running jobs
The following table shows the maximum number of simultaneously running jobs for
asynchronous basic instructions.
Basic instructions
CPU 1516pro-2 PN
Array DB
ReadFromArrayDBL uses READ_DBL (see Extended instructions)
WriteToArrayDBL
uses READ_DBL, WRIT_DBL (see Extended instructions)
Communication: maximum number of simultaneously running jobs
The following table shows the maximum number of simultaneously running jobs for
asynchronous instructions (Open User Communication) for the CPU.
Open User Communication
CPU 1516pro-2 PN
TSEND
TUSEND
256
TRCV
TURCV
256
TCON
256
TDISCON
256
T_RESET
256
T_DIAG
256
T_CONFIG
1
TSEND_C
uses TSEND, TUSEND, TRCV, TCON, TDISCON
TRCV_C
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
TMAIL_C
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
The following table shows the maximum number of simultaneously running jobs for
asynchronous instructions (MODBUS TCP) for the CPU.
MODBUS TCP
CPU 1516pro-2 PN
MB_CLIENT
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
MB_SERVER
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
The table below shows the maximum number of simultaneously running jobs for
asynchronous instructions (S7 communication) for the CPU. The S7 communication
instructions use a common pool of resources.
S7 communication
CPU 1516pro-2 PN
PUT
GET
USEND
URCV
BSEND
BRCV
768