Siemens SIMATIC S7-1500 Function Manual page 141

Web pages
3.16 User pages
Programming the WWW instruction
The user program must execute the WWW instruction in order that the user-defined pages
can be called in the Web server.
Table 3- 12
LAD/FBD
Parameters
The following table shows the parameters of the WWW instruction.
Table 3- 13
Parameters
CTRL_DB
RET_VAL
RET_VAL parameter
Table 3- 14
Error code (W#16#...)
0000
00xy
803A
8081
80C1
140
WWW instruction
SCL
ret_val
:=WWW(ctrl_db:=uint_in_)
;
Parameters
Declaration Data type
Input DB_WWW
Output INT
RET_VAL
Explanation
No error has occurred. There are no pending website requests that
must be released by the user program.
x: Indicates whether an error occurred during initialization of the
Web Control DB (CTRL_DB):
x=0: No errors occurred.
x=1: Error(s) occurred. The error is encoded in the byte
"CTRL_DB.last_error" of the Web Control DB.
y: Number of the pending request. Several requests are possible
(e.g., request "0" and "1" are pending: y="3").
y="1": Request "0"
y="2": Request "1"
y="4": Request "2"
y="8": Request "3"
The specified Web Control DB does not exist on the CPU.
Incorrect version or incorrect format of the Web Control DB.
There are no resources available to initialize the Web application.
Description
Access to user pages by means
of the Web server
Description
Data block that describes the user pages
(Web control DB)
Error information
Function Manual, 11/2019, A5E03484625-AG
Web server