SIWAREX WP251
Manual, 12/2015, A5E37203357A
21
SIWAREX WP251 controls complex dosing and filling processes completely autonomously.
The four digital outputs of the module can be used to directly control the dosing elements
(coarse and fine flow). Maximum accuracy is achieved since the weighing process is fully
independent of the CPU and its cycle time. The CPU can be used to manage recipes and
material parameters. These parameters and the desired set point are then transferred to
WP251 via a function block, and the dosing process is started. SIWAREX WP251
automatically optimizes the shut-off points, generates statistics, and logs every dosing
operation in the internal log memory, which is also accessible from the CPU and can be read
by the CPU. Various options are available for commissioning. The WP251 function block
enables full access to all parameters of the WP251. The free, downloadable example
application "Ready-for-use" enables complete commissioning, calibration and operation of
the scale from the touch panel - without any programming needed.
Furthermore, commissioning can be carried out with SIWATOOL V7, the PC service
software that communicates with the SIWAREX module via Ethernet. This enables access
via W-LAN when a WIFI access point is used. Remote access via the Internet is also
possible problem-free. Centralized access to all scales from a single location is possible for
servicing purposes – worldwide.
In addition, there is full access to all parameters and commands, both via the RS485 port
(Modbus RTU) and via the Ethernet interface (Modbus TCP/IP), meaning that full
commissioning and operation can also take place via these channels.
Stand-alone operation allows the module to be operated autonomously even without a
SIMATIC CPU. For this purpose, an HMI device can be connected directly to the Ethernet or
RS485 port of the WP251. The HMI device then communicates with the weighing module via
Modbus TCP/IP or RTU. This setup can also be selected to increase plant availability. If
WP251 is being operated with a SIMATIC S7-1200 and stand-alone operation is additionally
activated, WP251 can also continue operating (filling and dosing) without restrictions if the
CPU stops because a directly connected HMI device provides access to the module in this
situation.
The SIWAREX WP251 electronic weighing system can also be used in hazardous areas
(Zone 2). The load cells are supplied intrinsically safe in Zone 1 applications when you use
the optional Ex interface SIWAREX IS.
Parameter assignment options
4.2.1
Parameter assignment with the PC
The scale parameters can be quickly assigned with the convenience of a Windows program
using the "SIWATOOL V7" PC parameter assignment software.
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