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 DescriptionS7-300 SIWAREX U Ordering data
7MH4950-1AA01
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
7MH4950-2AA01
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

SIWAREX U offers the following key advantages:

  • 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

Technical specifications

SIWAREX U

Integration in automation systems

  • S7-300

Direct integration

  • S7-1500

Through ET 200M

  • S7-400 (H)

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

Communication interfaces

  • SIMATIC S7 (P bus)
  • RS 232
  • TTY

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)

Measuring properties

Error limit to DIN 1319-1 of full-scale value at 20 °C ± 10 K (68 °F ± 10 K)

0.05%

Internal resolution ADC
Data format of weight values

65535
2 byte (fixed-point)

Number of measurements/second

50

Digital filter

0.05 … 5 Hz (in 7 steps), mean value filter

Weighing functions

Weight values

Gross

Limit values

2 (min./max.)

Zero setting function

Per command

Load cells

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

  • RLmin

> 40 Ω per channel

  • RLmax

< 4010 Ω

With Ex(i) interface

  • RLmin

> 87 Ω per channel

  • RLmax

< 4010 Ω

Permissible load cell characteristic

Up to 4 mV/V

Max. distance of load cells

500 m2)
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

Rated voltage

24 V DC

Max. power consumption

150 mA (single-channel) / 240 mA (dual-channel)

Current consumption on backplane bus

≤ 100 mA

Certification

ATEX 95, FM, cULUS Haz. Loc.

IP degree of protection to DIN EN 60529; IEC 60529

IP20

Climatic requirements

Tmin (IND) to Tmax (IND)) (operating temperature)

  • Horizontal installation

0 … +60 °C (32 … 140 °F)

  • Vertical installation

0 … +40 °C (32 … 104 °F)

EMC requirements according to

according to NAMUR NE21, Part 1; EN 61326

Dimensions

40 x 125 x 130 mm (1.58 x 4.92 x 5.12 in)