Siemens SIMATIC S7-1500 System Manual page 234

Basics of program execution
9.5 Asynchronous instructions
Extended instructions
Module parameter assignment
RD_DPAR
RD_DPARA
RD_DPARM
Diagnostics
Get_IM_Data
GetStationInfo
Recipes
RecipeExport
RecipeImport
Data block functions
CREATE_DB
READ_DBL
WRIT_DBL
DELETE_DB
Communication: maximum number of simultaneously running jobs
Table 9-8 Maximum number of simultaneous jobs for asynchronous instructions and lower-level
instructions used for Open User Communication
Open User Communica­
tion
TSEND
TUSEND
TRCV
TURCV
TCON
TDISCON
T_RESET
T_DIAG
TSEND_C
TRCV_C
Table 9-9 Lower-level instructions used for asynchronous instructions for MODBUS TCP
MODBUS TCP
MB_CLIENT
MB_SERVER
234
1513R‑1 PN 1515R‑2 PN
1513R‑1 PN 1515R‑2 PN
up to V2.9.x
88 108
88 108
88 108
88 108
88 108
88 108
uses TSEND, TUSEND, TRCV, TCON, TDISCON
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
1513R‑1 PN 1515R‑2 PN
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
uses TSEND, TUSEND, TRCV, TURCV, TCON, TDISCON
1517H-3 PN
10
10
10
10
10
10
10
10
10
10
10
1517H-3 PN
V3.0 or
higher
128 288
128 288
128 288
128 288
128 288
128 288
1517H-3 PN
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
1518HF-4 PN
1518HF-4 PN
320
320
320
320
320
320
1518HF-4 PN