Basic Rules For System Configuration - Mitsubishi Electric FX Series Training Manual

System Configuration
2.10.2

Basic Rules for System Configuration

The following considerations should be taken into account when configuring a system with
extension units or special function modules:
b Current consumption from 5 V DC backplane bus
b 24 V DC current consumption
b The total number of inputs and outputs point must be smaller than the number of max. I/Os.
The following figure shows the distribution of the power supply in case of an FX
Power supply from
base unit
³: Special adapter
*
When connecting an input extension block on the downstream side of an extension power supply unit, this input
extension block is supplied from the base unit or from an input/output powered extension unit which is mounted
between base unit and extension power supply unit.
Calculation of current consumption
The power is supplied to each connected device from the built-in power supply of the base unit,
the input/output powered extension unit or – for FX
ply unit.
There are three types of built-in power supplies
– 5V DC
– 24V DC (for internal use)
– 24V DC service power supply (only in AC powered base units).
The following table shows the capacities of the built-in power supplies:
Model
Base units
Compact extension unit
When only input/output extension blocks are added, a quick reference matrix can be used.
When also special function modules are added, calculate the current consumption to ensure
that the total current to be consumed by the additional modules can be supplied by the built-in
power supply. For details of the power consumption please refer to the appendix (section A.4).
2 - 38
FX
· 3U
base unit
Power supply from
base unit
: Communication board or interface board
: Modular extension block or special function module
5 V DC built-in power supply
Suitable to power all connected
FX
1N
modules
FX 290 mA
2N
Sufficient for 2 special function mod-
FX
3G
ules or 32 additional I/O
FX 500 mA
3U
FX 400 / 480 / 560/ 600 mA
3UC
FX 690 mA
2N
Compact
extension
unit
Power supply from
compact extension
unit
and FX only– the extension power sup-
3U 3UC
24 V DC built-in power supply
(internal / service power supply
400 mA
250 mA (FX
460 mA (all other base units)
—
400 mA (FX
600 mA (all other base units)
—
250 mA (FX
460 mA (FX
The Hardware
.
3U
Extension
power
supply
Power supply from
extension power
supply unit*
-16M , FX -32M )
2N 2N
-16M , FX -32M )
3U 3U
-32E )
2N
-48E )
2N
MITSUBISHI ELECTRIC