Siwarex WP321

Siwarex WP321 is the new weighing module for the SIMATIC ET200SP series.

1 Basic Information

• The configuration is very similar to the SIWAREX CS Module.
• Major differences are that the communication interface is now RS485 (and not RS232 as the old siwarex cards)
• The old Siwarex cable from the Plug to the open wires don't work with RS485
• The software for parameterisation is the new SIWATOOL v7
• The software in our system uses a DWORD with an offset from 8.

1.1 Connect Online

The numbers in the right picture are the numbers of the blue Sockets and not the Pin-Numbers! Don't get wired!

File:ET200SP SiwarexWP Terminals.jpg File:ET200SP SiwarexWP RS485-USB.jpg

File:Siwarex RS485.PNG

• Connect a cable at the Siemens Terminals 13/14 with the USB converter at terminals T/R+, T/R- of the USB2RS485 adapter!
• Check in the device manager which COM-Interface is assigned to the RS485-USB converter.
• Set the COM-Interface in SIWATOOL v7 under Communication -> Choose Interface

Just to understand the differences between RS232 and RS485 here is a pin assignment picture below:

File:Siwarex V4 V7 RS232 RS485.jpg

2 Mechanical conditions

The conditions below must be clear. If only one load cell is installed, you can never measure as precisely as if one load cell were installed at all mechanical fixed points! The material of the filling cone and the emptying cone cannot be influenced. Please also inform the customer correctly if necessary. Shown here are several scenarios!

File:Siwarex WP321 mechanical conditions.jpg

3 Configuration in Siwatool

• Write down weight range and characteristic value written on the loadcell

File:Weight cell name plate.jpg

• Open SIWATOOL and choose Module WP321:

File:ET200SP SiwarexWP Siwatool1.jpg

• connect with SIWATOOL to the loadcell

File:ET200SP SiwarexWP Siwatool2.jpg

• activate the service mode and make a factory reset to get the default values:
  • Click on Service Commands File:ET200SP SiwarexWP Siwatool3.jpg and Service Mode ON (1) and then on Load factory settings (11)

EXAMPLES

General determinations Factor * in WinCC: If Newtons are needed we use it to transfer kg --> N --> *9,81 Factor / in WinCC: Value according PID and Film-angle to the load call. MDO most time between 1.5 and 2.0

• Set the following parameters under Calibration Parameters (DR3) /Basic Parameters:
  • Example 1 Silo Main Extruder Mixer Feeding Hopper:
    • Scale name: SilMexMixFdgHop
    • Weight unit: kg
    • No. of mechanical support points in Total: 3
    • No. of installed load cells: 3
    • Minimum weight (in d): 0
    • Maximum weight: according name plate from load cell multiplied with number of mounting points (load cells + mechanical points). If load cell has for example 1000kg you need to set 3000kg
    • Characteristic Value: According name plate, for example 2.85mV/V
    • Resolution d: 0.001
    • WinCC Factor *: 1.0
    • WinCC Factor /: 1.0
  • Example 2 Silo Storage:
    • Scale name: SilSto001
    • Weight unit: t
    • No. of mechanical support points in Total: 3
    • No. of installed load cells: 3
    • Minimum weight (in d): 0
    • Maximum weight: according name plate from load cell multiplied with number of mounting points (load cells + mechanical points). If load cell has for example 33t you need to set 99t
    • Characteristic Value: According name plate, for example 4.0mV/V
    • Resolution d: 0.001
    • WinCC Factor *: 1.0
    • WinCC Factor /: 1.0
  • Example 3 MDO PP with kg-Load Cells:
    • Scale name: StrMdoTenInl | StrMdoTenOut
    • Weight unit: kg
    • No. of mechanical support points in Total: 2
    • No. of installed load cells: 1
    • Minimum weight (in d): 0
    • Maximum weight: according name plate from load cell multiplied with number of mounting points (load cells + mechanical points). If load cell has for example 500kg you need to set 1000kg
    • Characteristic Value: According name plate, for example 2.0mV/V
    • Resolution d: 0.001
    • WinCC Factor *: 9.81 to konvert to "N"
    • WinCC Factor /: According PID, typically between 1.9 and 2.0
  • Example 4 MDO PET with N-Load Cells:
    • Scale name: StrMdoTenInl | StrMdoTenOut
    • Weight unit: N
    • No. of mechanical support points in Total: 2
    • No. of installed load cells: 2
    • Minimum weight (in d): 0
    • Maximum weight: according name plate from load cell multiplied with number of mounting points (load cells + mechanical points). If load cell has for example 10000N you need to set 20000N
    • Characteristic Value: According name plate, for example 2.0mV/V
    • Resolution d: 0.001
    • WinCC Factor *: 1.0
    • WinCC Factor /: According PID, typically between 1.8 and 2.0
  • Example 5 Winder Tension Roll:
    • Scale name: WinTenRol
    • Weight unit: N
    • ATTENTION: Because of 2 individual load cells and 2 individual Siwarex input cards, you need to configure each one seperately--> Each one has just 1 mechanical fix point and also only 1 installed load cell. The sum will be calculated in the PLC!
    • No. of mechanical support points in Total: 1
    • No. of installed load cells: 1
    • Minimum weight (in d): 0
    • Maximum weight: according nominal load of loadcell. For example 1500N
    • Characteristic Value: According name plate, for example 1.8mV/V
    • Resolution d: 0.001
    • WinCC Factor *: 1.0
    • WinCC Factor /: According PID, typically between 0.7 and 0.9
  • Example 6 Winder Unloader:
    • Scale name: WinUnl.PmtWeiLef / WinUnl.PmtWeiRit
    • Weight unit: kg
    • ATTENTION: Because of 2 individual load cells and 2 individual Siwarex input cards, you need to configure each one seperately--> Each one has just 1 mechanical fix point and also only 1 installed load cell. The sum will be calculated in the PLC!
    • No. of mechanical support points in Total: 1
    • No. of installed load cells: 1
    • Minimum weight (in d): 0
    • Maximum weight: according nominal load of loadcell. 10000kg/15000kg
    • Characteristic Value: According datasheet we have 0,5mV/V @ 5670kg
    • Nominal Load: 5670kg
    • Resolution d: 1.000
    • WinCC Factor *: 1.0
    • WinCC Factor /: 1.0

Perform a right click on Calibration Parameters (DR3) and click send data record to transfer the values.

File:ET200SP SiwarexWP Siwatool5.jpg

• Set the following parameters under Loadcell Parameters (DR10):
  • No. of mechanical support points: count all mechanical support points. E.g. for a hopper, which has only one loadcell but 3 support points in total, write 3 here. Same when 3 loadcells are installed.
  • Averaged characteristic value (mV/V): according loadcell nameplate
  • Nominal load of one single load cell: same value as set "Maximum weight" in Basic Parameters

Perform a right click on Load Cells Parameter (DR10) and click send data record to transfer the values.

File:ET200SP SiwarexWP Siwatool4.jpg

4 Automatic Calibration

• Be sure the loadcell is without load
• Click on Service Commands File:ET200SP SiwarexWP Siwatool3.jpg and choose Automatic Calibration (82). This command will also do zeroing.
• Click on Communication and Receive all data to takeover the calculated digits to the offline project
• Switch off Service Mode: Click on Service Commands File:ET200SP SiwarexWP Siwatool3.jpg and choose Service Mode OFF (2)

5 Configuration and calibration over WinCC

• Factor *: Used to convert from kg to N
• Factor /: Wrap angle
• Nominal Load: Always from ONE load cell
• Characteristic Value: Always from one load cell, but each of them should have the same value
• Numer Mechanical Supports: Total number of supports inclusive the load cell-point and all mechanical points together.

Example Main Extruder Hopper

File:Siwarex WP321 WinCC Spezific MEX Hopper.jpg

Example MDO Outlet

File:Siwarex WP321 WinCC Spezific MDO.jpg

Example Winder

File:Siwarex WP321 WinCC Spezific Winder.jpg

6 Test

• Take a known wheight and place it on the loadcell
• check if the weight in PVSS and in SIWATOOL is correct
• Remove the weight. The scale must show 0kg again.

7 Backup

• After receiving all data from the module and all tests are finished save the file and commit it in SVN under \\Kom\projects\Kom\_engineering\public\\load_cells\Siwarex.

8 Zeroing

If a zeroing after comissioning is necessary, do the following:

• connect to the module
• click Service Commands File:ET200SP SiwarexWP Siwatool3.jpg and Shift Characteristics (81)

9 Configuration with a backup file

• Open the backup file in SIWATOOL
• connect to the module
• Switch on Service Mode
• Send all parameters with Communication and Send all data
• Make a automatic configuration
• Receive all data to get the calculated digits
• Switch off Service Mode
• Save the file

Definition