Syncstop ................................. 23 III. List of figures Figure 1: Principle of a skin pass mill with the VLM500-DG system..............5 Figure 2: Example of a ring buffer of size 12 ...................... 6 Figure 3: Position of devices ..........................7 Figure 4: Measurement accuracy under laboratory conditions................9 Figure 5: Status page of the integrated webserver ...................
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Figure 9: Tunnel mode on ..........................20 Figure 10: Reference points for process calculation ..................21 Figure 11: Sync Analyzer ..........................24 Figure 12: cabling of VLM500-DG system ......................26 Figure 13: Wiring plan ............................. 27 List of tables Table 1: VLM500 Profinet modes (Profinet IN)....................11 Table 2: Minimum output times (all values in ms)....................
DG-Master and the DG-Slave and the calculation of the mass flow values, the busy LED in the cover of the DG-Master lights up yellow. Figure 1: Principle of a skin pass mill with the VLM500-DG system It is recommended to place the DG-master in the infeed of the system. DG-slave 1 comes to the outfeed. In case that a second slave device is installed, it is placed in the further / subsequent outfeed.
VLM500-DG User manual General information 1.2 Mode of operation Start of calculation After all devices are connected and switched on, the "SYNCSTART" command must be executed in the DG-Master. This can be achieved in two ways: in the case of a Profinet connection, bit 2 ("SYNCSTART") must be set in the control byte (see section 2).
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The time constant τ is used from the analysis of linear dynamic systems. τ is the time after which the response of a system has reached 63% of a sudden change at the input (step response). Translated to the VLM500-DG system, this means: τ...
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VLM500-DG User manual General information Whether the calculation will be done with reference to the in- or outfeed of the machine is controlled by the command SYNCBASIS. While the communication between the DG-master to the DG-slaves is active and the calculation of the skin pass level is running the Busy-LED of the Master lights up yellow.
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General information VLM500-DG User manual Accuracy of measurement The absolute error of the calculation of the skin pass level is equal to the sum of the relative errors of the two measuring devices. In the data sheet of the VLM500, the relative error specified under laboratory conditions is given as ±...
Data transmission Profinet The VLM500-DG system can be equipped with a Profinet interface. The associated IFPN interface card is installed in the DG master and connects it to the network. This enables the communication between a PLC and the DG master over large distances using standardized network components.
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Data transmission VLM500-DG User manual Table 1: VLM500 Profinet modes (Profinet IN) Mode Structure SYNCOUTPUT Remarks on table 1 16 Bit Counter The output of the numerical values via 32 Bit Skin pass level Profinet is always unsigned! 8 Bit VLM – error number...
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10,0 Parametrization via Profinet IO The VLM500-DG-Master sensor can be parametrized upon every bus start. Selected VLM500 – parameters can be changed according to the process needs. The following table show the available adjustable parameters. Table 3: Adjustable VLM500-DG-Parameter via Profinet...
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Data transmission VLM500-DG User manual Parameter Range Default value 0 or 1 Seltrigger 0 (off) 0 … 4 Tracking 0 … 5 Trigger 0 (High level) 0.01 – 100 m/s (0.01 steps) Vmax 4 ms/s 0.0000 – 100 m/s (0.0001 steps)
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VLM500-DG User manual Data transmission Digits of precision will be entered with integer values. Example: to set VMAX to 4.55 m/s the input of a value of 455 is necessary. If the parameter no. 24 “VLM parameter” is set to 1 the selected parameters are transmitted from the Profinet Master to the VLM500DG at every startup of the Profinet system or restart of the VLM500DG.
This type of transmission is particularly suitable for recording the measured values of the VLM500. A very helpful function when setting up and monitoring the VLM500-DG with Ethernet interface is the search for the measuring devices available in the network via a specified UDP broadcast.
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VLM500-DG User manual Data transmission One TCP/IP channel for the output of the current measured values Device acts as a server and can be accessed from anywhere on the network Standard port of VLM500 = 33005 ...
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Data transmission VLM500-DG User manual After setting up all parameters and settings, the following data stream can be streamed via the UDP interface. Table 6: VLM500-DG Data stream via UDP Size Data field Value 16 Bit Counter 32 Bit Skin pass level...
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VLM500-DG User manual Data transmission Control byte (can only be used with TCP) The TCP control byte has the same structure and meaning like the Profinet control byte. Table 8: Controlbyte IFFE Meaning Type Remark Standby Level LOW- level: <nothing>...
VLM500-DG User manual Programming The devices of the VLM500-DG system are programmed with the VLMTool. It is running under Microsoft Windows. This application is provided by ASTECH for free. After setting up the right communication port in the program options the VLMTool detects the connected VLM500-DG system. The DG system supports a group of additional commands and parameters.
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Otherwise these changes will be discarded. When the VLM500-DG system is in progress there is a permanent data exchange between the master and the slave(s). When the user wants to change parameters inside the master by activating the tunnel mode, the DG- system is not working as long as the tunnel mode is active.
Programming VLM500-DG User manual Sync The command reads all information which are relevant for the synchronous operation. In addition to the parameter settings there is also an indication of whether the current device is a DG master or DG slave.
VLM500-DG User manual Programming Table 10: Setting range of the parameter SYNCBASIS Value Meaning Calculation of the skin pass level based on the infeed (master) Calculation of the degree of stretching based on the infeed (slave 1) Calculation of the skin pass level based on the outfeed (slave 1)
This command reads the type of the device. If it is a master the response is “1”. In case of a slave the response is “0” Syntax: Syncstate In the VLM500-DG system, one device must be a master and at least one device must be a slave. Process values can only be calculated if a DG-master and a DG-slave are set correctly. Syncstop Calling up this command stops the skin pass and degree of stretching calculation.
VLM500-DG User manual Test mode Test mode The test mode can be used to visualize the process values without the need of a connected processing unit (e.g. PLC) to the master. When the test mode is active all relevant values are shared to the programming interface of the slave device.
Error messages VLM500-DG User manual Error messages In addition to the normal VLM error codes, the DG option provides Table 12. Table 12: Error list Code meaning Cause of error E70 SLAVE 1 Missing communication between The master did not receive an answer communication defective master and slave 1.
Device cabling Device cabling The following figure shows the wiring of the VLM500-DG system. The interconnection takes place in the form of a chain. The slave devices are identical and can be interchanged. Only the parameterization has to be adapted.
Wiring plan VLM500-DG User manual Wiring plan The devices are wired to one another according to a fixed scheme. Refer Figure 13. Master Slave 1 8-RD Brücke 54 50 Tri1+ 7-BU Brücke 53 49 Tri1- 1-WH Tri1+ 50 35 S2 T+...
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