Communication With Simatic S7-1200; Integration In Simatic S7-1200; General Information - Siemens SIWAREX WP251 Manual

Communication with SIMATIC S7-1200

11.1

Integration in SIMATIC S7-1200

11.1.1

General information

A SIWAREX WP251 occupies 32 bytes each in the input and output I/O areas of the CPU.
The maximum number of SIWAREX WP251 weighing modules is defined as follows:
● S7-1212 CPU → Up to a maximum of two WP251 weighing modules
● S7-1214 CPU → Up to a maximum of eight WP251 weighing modules
● S7-1215 CPU → Up to a maximum of eight WP251 weighing modules
● S7-1217 CPU → Up to a maximum of eight WP251 weighing modules
Additionally read the memory requirement for the function block call.
Note
The direct use of SIWAREX WP251 with fail-safe SIMATIC S7-1200 controllers is not yet
supported.
Table 11- 1
Read weight and status
Send commands
Send parameters
Main memory requirements in CPU
Load memory requirements in CPU
n = number of WP251 modules
The function block described above including HMI configuring can be downloaded as a
ready-made example project (https://support.industry.siemens.com/cs/ww/de/ps/17796)
("Ready-for-use") from the Siemens Industry Online Support.
The latest firmware version for the weighing modules can be downloaded at: Firmware
update (https://support.industry.siemens.com/cs/ww/de/ps/17796)
SIWAREX WP251
Manual, 12/2015, A5E37203357A
Memory requirements of the function block
FB with DS communication
(FB251 "WP251PR")
YES
YES
YES
15 600 bytes + n x 2 650 bytes
232 000 bytes + n x 62 000 bytes
11
185