SIEMENS SIMATIC S7-300 SIWAREX U Product Information
SIWAREX U is a versatile weighing module for all simple weighing and force measuring tasks. The compact module can be integrated into SIMATIC automation systems without any problems. Complete data access is possible via the SIMATIC.
Product No. / Product Description
S7-300 SIWAREX U Ordering data
SIWAREX U WEIGHING ELECTRONICS (SINGLE CHANNEL VERSION) * FOR CONNNECTING ONE SCALE * FOR SIMATIC S7-300 AND ET200M * RS232 INTERFACE FOR CONNECT. OF A PC * TTY INTERFACE FOR REMOTE DISPLAY CONNECTION WITH BUS CONNECTOR
SIWAREX U WEIGHING ELECTRONICS (TWO-CHANNEL VERSION) * FOR CONNNECTING TWO SCALES * FOR SIMATIC S7-300 AND ET200M * RS232 INTERFACE FOR CONNECT. OF A PC * TTY INTERFACE FOR REMOTE DISPLAY CONNECTION WITH BUS CONNECTOR
Uniform design technology and consistent communication in SIMATIC
Use in distributed plant concept through connection to PROFIBUS DB/PROFINET using ET 200M
Measurement of weight or force with a high resolution of 65000 parts and an accuracy of 0.05 %
Space saving through use of two-channel version for two scales
Direct connection of a remote display to the TTY interface
Simple adjustment of scale using the SIWATOOL U program
Supports theoretical adjustment without adjustment weights
Supports replacement of module without renewed adjustment of scale
Can be used in Ex applications
SIWAREX U is the optimum solution wherever strain gage sensors, such as load cells, force sensors or torque measuring shafts, are used for measuring tasks. The typical applications of SIWAREX U are:
Fill level monitoring of silos and bunkers
Monitoring of loads on cranes and cables
Measuring the loading on conveyor belts
Overload protection of industrial elevators or rolling mills
Balances in hazardous areas (using an Ex interface)
Monitoring of belt tension
The SIWAREX U is a compact function module (FM) of the SIMATIC S7-300 and can be snapped directly onto the SIMATIC S7-300 or ET 200M backplane bus. Assembly and wiring are also greatly simplified by using rails with snap-on technology.
The load cells, the power supply and the serial interfaces are connected through the 20-pin standard front plug.
Operation of the SIWAREX U in SIMATIC means that complete integration of the weighing technology into the automation system is provided.
SIWAREX U is available with either one or two measuring channels. One measuring channel is required for each set of scales.
The primary task of SIWAREX U is the measurement of sensor voltage and the conversion of this measurement into a weight value. The signal can also be digitally filtered if required.
As well as determining weights, the SIWAREX MS monitors two freely programmable limits (min./max. as required).
The SIWAREX U comes factory-calibrated. This means that theoretical adjustment of the scale is possible without adjustment weights, and that modules can be replaced without the need to readjust the scale. When using “active bus modules”, replacement is also possible during operation.
Consistent and uniform communication between all system components enables fast, reliable and cost-effective integration and diagnosis in industrial processes.
The SIWAREX U has two serial interfaces. The TTY interface serves to connect up to four digital remote displays. In addition to the two weight values of weighing channels 1 and 2, another two values can be set via SIMATIC and indicated on the remote displays.
A PC for adjusting the scale can be connected through the RS 232 interface.
SIWAREX U can not only be integrated in the plant software using the classic PLC programming languages; STL (Statement List), LD (Ladder Diagram) SFC (Sequential Function Chart) or SCL (Structured Control Language), it can also be integrated by means of graphical configuration with CFCs (Continuous Function Chart), where faceplates are provided in PCS 7 for visualization of the scales.
In contrast to serially linked weighing electronics, SIWAREX U does not need costly additional modules to link it to SIMATIC.
Integration in SIMATIC produces freely-programmable, modular weighing systems which can be modified according to operational requirements.
Using the SIWATOOL U software, the SIWAREX weighing modules can be set up with the convenience of Windows independently of the automation system. Input masks allow all parameters for the weighing modules to be specified, saved and printed for plant documentation.
The diverse diagnostic options provided by SIWATOOL U ensure fast fault locating in online mode.
The SIWAREX U weighing module can be used for potentially explosive areas (zone 2). The load cells can be provided with an intrinsically-safe power supply through an optional Ex interface.
Integration in automation systems
Through ET 200M
Through ET 200M
PCS 7 (H)
Through ET 200M
Automation systems from other vendors
Through ET 200M
Stand-alone (without SIMATIC CPU)
Possible with IM 153-1
SIMATIC S7 (P bus)
Connection of remote displays
(through TTY serial interface)
Gross, channel 1, 2 or default value 1, 2
Adjustment of scales settings
Through SIMATIC (P bus) or PC using SIWATOOL U (RS 232)
Error limit to DIN 1319-1 of full-scale value at 20 °C ± 10 K (68 °F ± 10 K)
Internal resolution ADC
Data format of weight values
2 byte (fixed-point)
Number of measurements/second
0.05 … 5 Hz (in 7 steps), mean value filter
Zero setting function
Strain gages in 4-wire or 6-wire system
Load cell powering
Supply voltage Us (rated value)
6 V DC1)
Max. supply current
≤ 150 mA per channel
Permissible load resistance
> 40 Ω per channel
< 4010 Ω
With Ex(i) interface
> 87 Ω per channel
< 4010 Ω
Permissible load cell characteristic
Up to 4 mV/V
Max. distance of load cells
150/500 m for gas group IIC
500 m2) for gas group IIB (see SIWAREX IS Manual)
Intrinsically-safe load cell powering
Optional (Ex interface) with SIWAREX IS
Auxiliary power supply
24 V DC
Max. power consumption
150 mA (single-channel) / 240 mA (dual-channel)
Current consumption on backplane bus
≤ 100 mA
ATEX 95, FM, cULUS Haz. Loc.
IP degree of protection to DIN EN 60529; IEC 60529