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Application planning
Power supply dimensioning > Calculation of the total current consumption
Parameter
Minimum bus cycle time
Galvanic isolation
Protection against electrostatic discharge
(ESD)
Table 3: Wiring (bus connection)
Parameter
Bus connection
Mechanical connection
Max. bus length
4.3 Power supply dimensioning
The power consumption of a complete station consists of the sum of all individual consump-
tions.
The two supply voltages with 24 V DC are distinguished in the AC500 platform:
●
Supply of the internal logic via terminals L+ and M on the CPU module, or an the AC500
terminal base for: CPU, communication mudule(s) and I/O bus.
●
Supply of the process-side input/output circuits for analog signals and 24 V DC digital
signals via the ZP and UP terminals of the S500 terminal units.
The two supply voltages can be provided by the same power supply unit. The CPU and the
I/O modules should, however, be fused separately. Of course also separate power supplies are
possible.
4.3.1 Calculation of the total current consumption
Example
In the example, the AC500 control system consists of the following devices:
●
AC500 CPU with Ethernet interface
●
4 communication modules
●
7 I/O modules (digital and analog)
●
As well as the required terminal bases and terminal units
26
Value
500 µs
This value is valid for all module combinations
(from 1 to 10 I/O modules)
I/O bus is galvanic connected to CPU and
communication interface logic ciruits. Galvanic
isolation of I/O bus is I/O module specific. See
each module specification for details.
TB5xx, TB56xx: with protection diodes,
no ESD discharge allowed on the port.
Value
Left-side and right-side connection from
module to module via a 10-pole HE plug (male
at the left side, female at the right side)
Established by the terminal units
1 m
3ADR011074, 1, en_US
2023/03/03
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