
D301141 1211 - BL20-ECO DeviceNet™ iii
6 Guidelines for Station Planning
6.1 Module Arrangement......................................................................................................................................6-2
6.1.1 Random Module Arrangement .........................................................................................................................................................6-2
6.1.2 Complete Planning................................................................................................................................................................................6-2
6.2 Maximum System Extension ..........................................................................................................................6-3
6.3 Power Supply ...................................................................................................................................................6-6
6.3.1 Power Supply to the Gateway ...........................................................................................................................................................6-6
6.3.2 Module Bus Refreshing ........................................................................................................................................................................6-6
6.3.3 Creating Potential Groups...................................................................................................................................................................6-6
6.3.4 C-Rail (Cross Connection)....................................................................................................................................................................6-7
6.3.5 Direct Wiring of Relay Modules.........................................................................................................................................................6-9
6.4 Protecting the Service Interface on the Gateway ...................................................................................... 6-10
6.5 Plugging and Pulling Electronics Modules................................................................................................. 6-10
6.6 Extending an Existing Station ..................................................................................................................... 6-10
6.7 Firmware Download..................................................................................................................................... 6-10
7 Guidelines for Electrical Installation
7.1 General Notes ..................................................................................................................................................7-2
7.1.1 General.......................................................................................................................................................................................................7-2
7.1.2 Cable Routing ..........................................................................................................................................................................................7-2
7.1.3 Lightning Protection.............................................................................................................................................................................7-3
7.1.4 Transmission Cables..............................................................................................................................................................................7-3
7.1.5 Cable Types ..............................................................................................................................................................................................7-3
7.2 Potential Relationships...................................................................................................................................7-4
7.2.1 Potential-Free Installation...................................................................................................................................................................7-4
7.3 Electromagnetic Compatibility (EMC) ...........................................................................................................7-6
7.3.1 Ensuring Electromagnetic Compatibility.......................................................................................................................................7-6
7.3.2 Grounding of Inactive Metal Components ...................................................................................................................................7-6
7.3.3 PE Connection .........................................................................................................................................................................................7-6
7.3.4 Earth-Free Operation ............................................................................................................................................................................7-6
7.3.5 Protection against high frequency interference signals..........................................................................................................7-7
7.3.6 Mounting Rails.........................................................................................................................................................................................7-7
7.3.7 EMC Compliant Cabinet Installation ...............................................................................................................................................7-8
7.4 Shielding of cables ..........................................................................................................................................7-9
7.4.1 Potential Compensation................................................................................................................................................................... 7-10
7.4.2 Switching Inductive Loads............................................................................................................................................................... 7-11
7.4.3 Protection against Electrostatic Discharge (ESD) .................................................................................................................... 7-11
8 Integration of Technology Modules in DeviceNet™
8.1 Counter module, BL20-1CNT-24VDC .............................................................................................................8-2
8.1.1 Process Input for Count Mode...........................................................................................................................................................8-2
8.1.2 Process Output for Count Mode.......................................................................................................................................................8-2
8.1.3 Process Input for Measurement Mode ...........................................................................................................................................8-4
8.1.4 Process Output for Measurement Mode .......................................................................................................................................8-5