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The shielding of measurement lines must be fastened to ground on both ends.
Run cable shielding directly under the SIWAREX FTA on the shielding channelling.
The shielding is to be run to the connection terminal.
The connection between the shielding rail / ground rail and the cabinet /housing
must be low impedance.
Use metallic or metal-plated connector housings for the shielded data lines.
Rule 4: Special EMC measures
All inductivity that is to be controlled should be connected with suppressors.
Use interference suppressed fluorescent lighting or incandescent lamps for
illuminating cabinets or housings in the immediate vicinity of your controller.
Rule 5: Uniform reference potential
Create a uniform reference potential and ground all electrical operational elements.
Run sufficiently dimensioned potential equalizing cabling if potential differences
exist or are to be expected between system components in the system. A potential
equalisation is mandatory for Ex applications.
4.4 Assembly on the Profile Rail
When assembling the SIMATIC components and the SIWAREX FTA, the assembly
regulations (AR) for the SIMATIC S7 must be fulfilled completely.
SIWAREX FT is assembled in the following steps.
1. Check for whether the SIMATIC bus connector is connected to the left of the
SIWAREX FTA in the module group.
2. Connect the SIMATIC bus connector for the following module group in the
SIWAREX if necessary.
3. Install the shielding strip under SIWAREX.
4. Hang the SIWAREX FTA in its place.
5. Fasten the SIWAREX FTA with 2 screws in the lower area of the module.
6. Label the SIWAREX FTA corresponding to your identification system.
4.5 Connections and Cabling
4.5.1
Connection areas for SIWAREX FTA
The following connection areas are found on the front:
SIWAREX FTA
Hardware Planning and Assembly
4-17
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