Siemens MOBY I RFID System Configuration and Application Guide

Key technical points for system configuration and installation

The successful deployment of MOBY I system requires careful planning and configuration, and the following technical steps are crucial:

1. Calculation of transmission window and communication time

The effective area of the sensing field generated by the reading and writing device in space is called the "transmission window". Its shape is usually symmetrical about the SLG, containing two active regions with a possible signal gap in between (depending on the MDS model and direction). The key parameters include:

Operating distance (Sa): The range of reliable reading and writing distances.

Extreme distance (Sg): The farthest distance at which MDS can still be activated.

Window length (L) and width (B): determine the spatiotemporal window through which MDS can exchange data dynamically.

In dynamic operations, the transmission time (tF) must be greater than or equal to the communication time (tK). TV depends on the window length and MDS movement speed, while tK is determined by the system's internal time constant (K), transmission time per byte (t_byte), and data volume (n). Engineers must calculate the maximum amount of data that can be transmitted based on the production line speed, or determine the minimum allowable speed based on data volume requirements.

2. The impact and response of metal environment

Metal objects can significantly interfere with the induction field, leading to a reduction in transmission window size, shape distortion, or a shortened limit distance. During installation, it is necessary to follow:

Metal free space: Maintain a designated metal free area around MDS and SLG (size varies by model), especially during embedded installation.

Minimum spacing: Ensure the minimum distance between MDS and SLG to prevent inter field coupling interference.

Compensation measures: When it is impossible to avoid metal approaching, non-metallic gaskets can be used to increase spacing, rotate the SLG 90 ° to change the field direction, or increase the parasitic field of iron pillar short-circuit.

3. Electromagnetic Compatibility (EMC) Guidelines

To ensure stable operation of the system in an industrial electromagnetic environment, it is necessary to follow EMC guidelines:

Cabinet layout: Separate strong and weak electricity, lay signal and power lines in separate slots, and maintain a distance of at least 10 centimeters.

Shielding and grounding: All data cables must use a braided shielding layer and be extensively overlapped at both ends to the shielding and grounding bars. The metal components of the cabinet need to have good high-frequency conductive connections.

Equipotential connection: Use multi stranded wires with a cross-sectional area of not less than 10mm ² to connect the grounding points of each part of the system, reducing the balanced current caused by potential difference.

Interference source suppression: Install freewheeling diodes or RC circuits to suppress peak voltage on all inductive loads (contactors, relay coils).

Key configuration points for special models

MDS 507 and SLG 44: As MDS 507 relies on the built-in battery for operation, it is necessary to set the "ABTAST" parameter reasonably, that is, to cyclically query the time interval of signal existence, in order to avoid excessive discharge of the battery when the MDS stays near the SLG field for a long time. The transmission window has a complex shape, including both main and side lobes, and requires detailed field diagrams for configuration.

MDS 439E high temperature resistant type: When the internal temperature exceeds 85 ° C, its field length and limit distance will linearly decay with increasing temperature (offset coefficient C). In cyclic high-temperature applications, it is necessary to plan heating and cooling cycles to ensure that the internal chip temperature does not exceed the critical value of 110 ° C.

Cable connection and system integration

The MOBY connecting cable adopts a polyurethane (PUR) sheath, which is resistant to oil, acid, alkali, and hydraulic oil. A 6-core shielded cable is usually used between ASM and SLG (4-core for RS-422 data and 2-core for power supply). The maximum allowed cable length depends on the wire diameter and SLG current consumption (ranging from 70mA to 250mA), with a maximum length of up to 1000 meters. To achieve maximum distance, an auxiliary power supply can be installed near the SLG.

All prefabricated cables and plugs have clear order numbers. During installation, the cable shielding layer must be grounded with a large area, high frequency, and low impedance at both ends through shielding clamps or shielding bars. This is a key step in ensuring signal integrity and anti-interference ability.

Summary of Application Fields and Advantages

The Siemens MOBY I system, with its outstanding performance, is widely used in:

Processing and manufacturing: The data carrier is fixed on the product carrier to track production parameters.

Assembly line: fixed on the workpiece carrier, transmitting assembly instructions and status.

Conveyor system: installed on suspended tracks or trays to achieve routing control and sorting.