SIWAREX WP231 – Weighing Electronics Module – Siemens Modules

USD $ 873.81

SKU: 7MH4960-2AA01

SIWAREX WP231 is the optimum solution wherever load cells are used for measuring tasks. The following are typical SIWAREX WP231 applications:

  • Non-automatic weighing instruments, also legal for trade
  • Fill level monitoring of silos and bunkers
  • Measuring of crane and cable loads
  • Load measuring for industrial lifts and rolling mills
  • Scales in zone 2 hazardous areas
  • Force measuring, hopper scales, platform scales and crane scales

Siemens Modules WP231 Product Specifications:

Article Number

7MH4960-2AA01

Integration in automation systems

S7-1200

SIMATIC S7‑1200 system bus

Operator panel and/or automation systems from other vendors

Via Ethernet (Modbus TCP/IP) or RS 485 (Modbus RTU)

Communication interfaces

  • SIMATIC S7‑1200 backplane bus
  • RS 485 (Modbus RTU, Siebert remote display)
  • Ethernet (SIWATOOL V7, Modbus TCP/IP)
  • Analog output 0/4 … 20 mA
  • 4 × digital outputs 24 V DC, floating, short-circuit proof
  • 4 × digital inputs 24 V DC, floating

Commissioning options

  • Using SIWATOOL V7
  • Using function block in SIMATIC S7‑1200 CPU / Touch Panel
  • Using Modbus TCP/IP
  • Using Modbus RTU

Measuring accuracy

EC type approval as non-automatic weighing instrument, trade class III

3000 d ≥ 0.5 μV/e

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

0.05%

Internal resolution

Up to ± 4 million parts

Measuring frequency

100 / 120 Hz

Digital filter

Variable adjustable low-pass and average filter

Typical applications

  • Non-automatic weighing instruments
  • Force measurements
  • Fill-level monitoring
  • Belt tension monitors

Weighing functions

Weight values

  • Gross
  • Net
  • Tare

Limit values

  • 2 × min/max
  • Empty

Zeroing

Per command

Tare

Per command

Tare specification

Per command

Load cells

Full-bridge strain gauges in 4-wire or 6-wire system

Load cell powering

Supply voltage (regulated via feedback)

4.85 V DC

Permissible load resistance

  • RLmin

> 40 Ω

  • RLmax

< 4 100 Ω

With SIWAREX IS Ex interface

  • RLmin

> 50 Ω

  • RLmax

< 4 100 Ω

Load cell characteristic

1 … 4 mV/V

Permissible range of the measurement signal (with 4 mV/V sensors)

-21.3 … +21.3 mV

Max. distance of load cells

500 m (229.66 ft)

Connection to load cells in Ex zone 1

Optionally via SIWAREX IS Ex interface (compatibility of the load cells must be checked)

Approvals/certificates

  • ATEX Zone 2
  • UL
  • EAC
  • KCC
  • RCM
  • OIML R76
  • Type approval 2009/23/EC (NAWI)

Calibration approval

EC type approval OIML R76

Auxiliary power supply

Rated voltage

24 V DC

Max. power consumption

200 mA

Max. power consumption SIMATIC Bus

3 mA

IP degree of protection to EN 60529; IEC 60529

IP20

Climatic requirements

T min (IND) … Tmax(IND) (operating temperature)

  • Vertical installation

-10 … +40 °C (14 … 104 °F)

  • Horizontal installation

-10 … +55 °C (14 … 131 °F)

EMC requirements

According to EN 45501

Dimensions

70 × 75 × 100 mm (2.76 × 2.95 × 3.94 inch)

Weight 0.280 kg
Dimensions 8.9 × 11 × 8.8 cm