turck BL20-GW-CANOPEN, User Manual, Page: 58 / 95

Guidelines for Station Planning
D301087 1211 - BL20 CANopen 6-4
6.2 Power Supply
6.2.1 Gateway Supply
6.2.2 Module Bus Refreshing
The number of BL20 modules that can be supplied by the gateway or a separate Bus Refreshing module
via the internal module bus depends on the respective nominal current consumption of the individual
modules on the module bus.
The following examples show the calculation for the required number of Bus Refreshing modules:
Example 1:
The BL20 station consists of 20 BL20-1AI-I(0/4...20MA) modules. The number of additional Bus
Refreshing modules required is calculated as follows:
The calculation shows that no further Bus Refreshing module is required.
Note
On a BL20 station including a gateway without integrated power supply unit, the first module
to be mounted after the gateway is a Bus Refreshing module with either a BL20-P3x-SBB or a
BL20-P4x-SBBC base module with tension clamp or screw connection.
Attention
The sum total of the nominal current consumption of the connected BL20 modules must not
exceed 1.5 A.
Gateway 430 mA
20 BL20-1AI-I(0/4...20MA) 20 x 41 mA 820 mA
Total: 1250 mA
Maximum permissible current via module bus: 1 500 mA