Appendix E: Implementation Guidelines
45 (48)
E.3
Power Supply Considerations
E.3.1
General
The Anybus CompactCom 40 platform in itself is designed to be extremely power efficient. The
exact power requirements for a particular networking system will however vary a lot depending
on the components used in the actual bus circuitry.
While some systems usually require less than 250 mA of supply current at 3.3 V, some high
performance networks, or networks which require the use of legacy ASIC technology, will
consume up to 500 mA, or in rare cases even as much as 1000 mA.
As an aid when designing the power supply electronics, the networks have been divided into
classes based on their power consumption as follows.
•
Class A: less than 250 mA
•
Class B: up to 500 mA
•
Class C: up to 1000 mA
Please note that the power supply classifications take into account that the power budget is
shared with a full fieldbus circuitry, e.g. the appropriate connector board and NW_LEDs with
maximized consumption (20 mA each).
The following table lists the currently supported networking systems and their corresponding
class.
Network
Class A
Class B
Class C
DeviceNet
X
PROFIBUS
X
CANopen
X
EtherCAT
X
PROFINET 2-Port
X
PROFINET FO 2-Port
X
Ethernet/IP 2-Port
X
EtherNet POWERLINK
X
Common Ethernet
X
CC-Link
X
Modbus-TCP 2-Port
X
CC-Link IE Field
X
BACnet/IP
X
A power supply designed to fulfill Class A requirements (250 mA), will be able to support all
networks belonging to class A, but none of the networks in Class B and C.
A power supply designed to fulfill Class C requirements, will be able to support all networks.
Anybus
®
CompactCom
™
B40 Modbus Serial User Manual
SCM-1202-130 1.1 en-US
