Weighing modes

• Non-automatic scales, e.g. platform and hopper scales

Ports

• 1 x SIMATIC S7-1500 system bus
• 1 x Ethernet (SIWATOOL, Modbus TCP/IP)
• 1 x RS485 (Modbus RTU or remote display) per channel
• 3 x digital outputs (24 V DC) per channel
• 4 x digital outputs (24 V DC short-circuit proof) per channel

Functions

• 3 limits
• Zeroing
• Tare
• Tare specification
• Zero adjustment
• Trace function for signal analysis
• Internal restore point
• SIMATIC S7-1500 integrated and/or stand-alone operation

Parameter assignment

• By means of function block in SIMATIC S7-1500 and HMI
• Using SIWATOOL V7
• Using Modbus TCP/IP
• Using Modbus RTU

Remote display (see accessories)

Connection

via RS 485

Display

Additional display for weight value

Measuring accuracy

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

Number of measurements/second

100 or 120 (selectable)

Filter

• Low-pass filter 0.05 ... 50 Hz
• Average value filter

Weighing functions

Weight values

• Gross
• Net
• Tare

Limit values

• 2 x Min/Max
• 1 x empty

Zeroing

Per command

Tare

Per command

Tare specification

Per command

Compatible sensors

Analog load cells / full-bridge strain gauges (1-4 mV/V) in 4-wire or 6-wire system

Load cell powering

Supply voltage (regulated via feedback)

4.85 V DC

Permissible load resistance

• R_Lmin

> 40 ?

• R_Lmax

< 4 100 ?

With SIWAREX IS Ex interface

• R_Lmin

> 50 ?

• R_Lmax

< 4 100 ?

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

800 m (2 624 ft)

Connection to load cells in Ex zone 1

Optionally via SIWAREX IS Ex interface

Certificates

• ATEX Zone 2
• UL
• KCC
• EAC
• RCM

Auxiliary power supply

Rated voltage

24 V DC

Max. power consumption WP521 ST / WP522 ST

120 mA / 200 mA

Max. power consumption SIMATIC Bus

35 mA @ 15 V

IP degree of protection according to DIN EN 60529; IEC 60529

IP20

Climatic requirements
T_min(IND) ... T_max(IND) (operating temperature)

• Horizontal installation

-10 ... +60 °C (14 ... 140 °F)

• Vertical installation

-10 ... +40 °C (14 ... 104 °F)

EMC requirements

according to IEC 61000-6-2:2004; IEC 61000-6-4:2007+A1:2011

Dimensions (W x H x D)

35 x 147 x 129 mm (1.38 x 5.79 x 5.08 in)