FAQ about HMI. Installation Guidelines of the Transponders for the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN FAQ

Transcription

1 FAQ about HMI Installation Guidelines of the Transponders for the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN FAQ

2 Table of Contents Table of Contents... 2 Question...2 Which installation guidelines have to be observed for the transponders for the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN?... 2 Answer Installation Guidelines Zones depending on transponder and panel The effect of metal on the zone Metallic objects in the near field of the transponders and the mobile panels Metallic objects in the wider field of the transponders and the mobile panels The effect of non-metallic materials or objects on the zone Interference and users in the 2.45 GHZ range User Information and Installation Instructions Procedure for a signal elimination within the zone Change of position Changes of the orientation of the mobile panel (line of sight) Change of the transponder s mounting height or place of installation Adding of a second transponder defining the same zone Incorrect measurement within the zone Determination of dead spots and interference signals History Question This entry is from the Internet offer of Siemens AG, Automation and Drives, Service & Support. The link below takes you directly to the download page of this document. HHUhttp://support.automation.siemens.com/WW/view/de/ UH Which installation guidelines have to be observed for the transponders for the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN? Answer The instructions and notes listed in this document provide a detailed answer to this question. V /13

3 1 Installation Guidelines The transponders, the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN communicate via radio exclusively in the 2.45 GHZ range. This is independent of the used WLAN standard (for example, IEEE h / 5 GHZ) between the operator panel and the access point. When using transponders, the WLAN standards (e.g., IEEE b/g) in the 2.4 GHZ range must not be used for the communication. To ensure interference-free communication, materials shielding or absorbing high-frequency radiation must not exist in the high-frequency field or only under specific conditions. To make sure that the field data described in the operating instructions of the Mobile Panel 277 IWLAN and the Mobile Panel 277F IWLAN is valid, several points have to be observed when configuring and when mounting: Minimum distance between two adjacent Mobile Panels IWLAN: 10m The transponders may also be mounted directly on metal The transponders must not be mounted in depressions Minimum mounting distance to floor or ceiling for the transponders: 1.2m The effect of metal on the zones or effective ranges The effect of non-metallic materials or objects on the zones or effective ranges Interference and users in the 2.45 GHZ range The following chapters provide a description of the zones depending on the assignment of transponder and panel, the effect on the zones and the effect of interference and users in the 2.45 GHZ range. Only the communication between the mobile panel and the transponder is referred to as distance measurement, not the communication between mobile panel and access point. V /13

4 1.1 Zones depending on transponder and panel The zone is the range in which the communication between the transponder and the mobile panel has to take place. The zone is determined by: The radiation characteristics of the transponders The radiation characteristics of the panel The mechanical arrangement of the transponders and the panel with respect to one another The parameterized range of the zone. These dependencies apply analogously to the effective ranges. Table 1-1 Transmission and reception range Operator panel in the transmission range of the transponder Transponder in the reception range of the operator panel Spatial arrangement Result Successful distance measurement Operator panel in the transmission range of the transponder Transponder not in the reception range of the operator panel Distance measurement not possible Operator panel not in the transmission range of the transponder Transponder in the reception range of the operator panel Distance measurement not possible Legend: Transponder Operator panel V /13

5 The distance between operator panel and transponder can only be measured if both devices are in the respective reception range of the other device. The table (table 1-1) shows when a distance measurement is successful. The pictures show the operator panel as a circle and the transponder as a square. The arrangement between the operator panel and the transponder is optimal when both antenna sides are turned to one another spatially and when they are aligned in parallel. Figure 1-1 Note Figure 1-1 shows the radiation characteristics of the transponder. The display of the mobile panel is equivalent to the distance between mobile panel and transponder. 100% correspond to half the configured zone size (figure 1-1). Exiting the zone to the right is thus not accompanied by a reduction of the zone display. (For example, sudden change between 100% and zone not detected [red]). 1.2 The effect of metal on the zone Depending on the arrangement or the environment, metal has various effects on the zone: From no noticeable effect to the point of complete prevention of communication or distance measurement. The term metal also applies to metallized materials that are, for example, metal-coated or interwoven with metal in such a way that they let through an insufficient amount of high-frequency radiation or none at all. The effect of metal on the zone has to be looked at from the following points of view: Metallic objects in the near field of the transponders and the operator panels Metallic objects in the wider field of the transponders and the operator panels V /13

6 1.2.1 Metallic objects in the near field of the transponders and the mobile panels The near field of the antenna is a half-space above the antenna with a radius of approximately 50mm. No metallic objects must be located in this area. If metallic objects are located in the near field, a changed antenna field has to be expected. This can even cause a complete shielding of the field. The transponders may be mounted directly on metal. This does not result in noticeable field changes. The transponders must not be flush-mounted in metal. Since the antenna is integrated on the transponder front, it has to be observed that all metallic objects in the near field of the antenna can affect the antenna Metallic objects in the wider field of the transponders and the mobile panels If metallic or metallized objects are located in the wider field, they change depending on their size and spacing the antenna field and cause field strength fluctuations. Metallic surfaces reflect the waves and can thus cause a shielding but also a deflection. V /13

7 1.3 The effect of non-metallic materials or objects on the zone Depending on the arrangement or the environment, non-metallic materials can also affect the zone if they are located in the near field of the antenna or in the wider field of the transponders or the operator panels. Examples: Water Materials containing water or soaked with water Ice Carbon Soil The antenna of both the transponder and the operator panel is integrated on the front. For this reason, it has to be observed that all non-metallic materials in the near field of the antenna absorbing the high-frequency radiation affect this radio link. The near field of the antenna is a half-space above the antenna with a radius of approximately 50mm. No non-metallic objects absorbing high-frequency radiation must be located in this area. If non-metallic objects are located in this area, a changed antenna field has to be expected. This can even cause an elimination of the field. If non-metallic objects absorbing high-frequency radiation are located in the wider field, they can depending on their size and spacing change the antenna field and even cause an elimination of the field. Note High-frequency radiation does not pass through tissue of the human body. For this reason, it has to be ensured that there is nobody between the transponder and the panel when establishing the communication or during the actual communication or distance measurement. If somebody is located between the transponder and the panel when establishing a communication or performing a distance measurement, the transponder is not detected and no communication takes place. V /13

8 1.4 Interference and users in the 2.45 GHZ range Industrial contaminating fields may exist in the 2.45 GHZ frequency band. The distance measurement between the mobile panel and the transponder may also negatively affect other radio components in the same frequency band. The following radio components may cause an interaction with the mobile panels: SRIF (Serial Radio Interface) RFID (Radio Frequency Identification) (for instance, Moby systems) WLAN (Wireless Local Area Network) Bluetooth Microwave ovens If interference signals by other radio components are within the zone, special measures have to be taken to eliminate these interference signals. To eliminate these interference signals from other radio components, the following measures have to be implemented if possible: Reduction of the transmission range of the interfering radio components Change of the frequency band of the interfering radio components responsible (for example, channel change for WLAN) Adequate distance between the mobile panel system and the interfering radio components Useful change of the spatial arrangement of all relevant radio components so that mutual interference is not possible Shielding of the individual radio areas V /13

9 2 User Information and Installation Instructions The communication between the transponder and the mobile panel can be impaired by reflections of metallic parts. These reflections may cause overlay of signals with different transit times that contribute to a weakening or also an elimination of the signal. Normally, this effect is limited to a specific area. Re-adjusting the antenna in this area sometimes only a few centimeters is mostly sufficient to eliminate this effect. 2.1 Procedure for a signal elimination within the zone Due to the points described in the installation guidelines, a signal elimination within a zone may occur in an industrial environment. A signal elimination has occurred for the Mobile Panel IWLAN when the effective range or the zone within the effective range or the zone is not detected. If the environment or the system parameters remain unchanged, the locations of the signal elimination points also remain unchanged. In an industrial environment, the system parameters of the transmission between transponder and mobile panel are influenced by the following points: Change of the distance (also mounting height) of the mobile panel to absorbing or reflecting materials (also body height of the user) Change of the distance (also mounting height) of the transponder to absorbing or reflecting materials Objects in the area between mobile panel and transponder, for example devices, tools, machines Change of the orientation of the mobile panel (line of sight) The following section shows options enabling users and fitters to operate the Mobile Panel IWLAN without difficulty also in the event of signal eliminations within the zone: Change of position Change of the orientation of the operator panel (line of sight) Change of the transponder s mounting height or place of installation Adding of a second transponder defining the same zone V /13

10 2.1.1 Change of position If the user moves freely within the zone and if he/she enters the point of a signal elimination within a zone, the mobile panel indicates the fact that he/she has exited the zone to the user. A minor change of the position, for instance one step forward, back, to the left or to the right, is mostly sufficient to return to the zone Changes of the orientation of the mobile panel (line of sight) The antenna of the mobile panel is located on the front and has a radiation pattern as described in the operating instructions. An arrangement would be optimal if the transponder and the mobile panel were facing one another with the antenna side and if they were aligned in parallel. If the user holds the mobile panel turned out of position horizontally or vertically, this may result in the transponder not being detected and the mobile panel signals that the zone has been exited. It is mostly sufficient to slightly turn the mobile panel (aim it at the transponder) to return to the zone Change of the transponder s mounting height or place of installation If the signal elimination point is at a location where the user requires correct reception, you can proceed as described in the following example: In the example below, the signal elimination is caused by a reflection of the floor: Figure 2-1 Mobile Panel To verify that the signal elimination of the field is generated by the floor reflection (figure 2-1), change the distance of the mobile panel to the floor. If the transponder is detected again, you can enable correct reception by changing the distance of the transponder to the floor. The following example shows how to obtain a guide value for the offset: V /13

11 Figure 2-2 Mobile Panel Δh Height Panel Height For example, if there is no signal elimination for the offset of the mobile panel (figure 2-2) at the height by 20cm (Δh), the transponder also has to be moved upwards by 20cm (Δh) (figure 2-3). Figure 2-3 Mobile Panel Height + Δh Proceed accordingly for a signal elimination due to a lateral reflection (e.g., by a wall), but then in horizontal direction. V /13

12 2.1.4 Adding of a second transponder defining the same zone The moving of the transponder may result in the development of the signal elimination at another point within the zone. This can be prevented by not moving the transponder but by installing an additional transponder. The example below shows how to obtain a guide value for the distance between the two transponders: Figure 2-4 Mobile Panel Δh Height Panel h Height For example, if there is no signal elimination for the offset of the mobile panel (figure 2-4) at the height by 20cm (Δh), this is remedied by a second transponder at a vertical distance of 20cm (Δh) (figure 2-5). By mounting the second transponder, the signal to the mobile panel at the original height (h) is then not eliminated. Figure 2-5 Added Mobile Panel + Δh Already mounted h Height Proceed accordingly for a signal elimination due to a lateral reflection (e.g., by a wall), but then in horizontal direction. V /13

13 2.2 Incorrect measurement within the zone Due to the points described in the installation guidelines, an incorrect measurement within a zone may occur in an industrial environment. An incorrect measurement is caused by the reflection of the high-frequency radiation by absorbing or reflecting materials within the zone. Instead of the direct distance between transponder and mobile panel, the distance is measured by means of the reflection. Therefore, an incorrect measurement is only indicated by values that are greater than the actual distance. If the value measured by the incorrect measurement is outside the configured zone, the mobile panel indicates that the user has exited the zone. This behavior occurs particularly when exiting or entering at the maximum outer limit of the zone. 2.3 Determination of dead spots and interference signals 3 History Within the plant dead spots or interference signals can be determined with the mobile panel and the configured zone quality display. This requires that the batteries in the transponder be functional and that the mobile panel be within the range of the transponder and the configured zone. Table 3-1 History Version Date Modification V1.0 08/18/08 First edition V /13