Mitsubishi FX3G SERIES User Manual page 62

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
3
Connection restriction and calculation of current consumption
The number of points and number of units connected are restricted by the number of extension
blocks connected to the main unit.
The built-in power supply of the input/output powered extension unit and extension power supply
unit supplies the power to a unit/block/board extended to the corresponding unit. The built-in power
supply refers to the 24V DC service power supply, 5V DC power supply and internal 24V DC power
supply.The consumed power varies depending on the type of extended unit/block/board.
Special Expansion
adapter board
Power supply
from main unit
Refer to Section 6.4.
*1. When connecting an input extension block on the downstream side of an extension power supply unit,
supply the power to the input extension block from the nearest main unit on the upstream side, or from
an input/output powered extension unit on the upstream side of the extension power supply unit.
In the example above, the input/output powered extension unit supplies the power to extension
blocks.
4
Other restrictions
• Restrictions in the use of the FX
- When connecting a device (such as GOT) which consumes an internal 5V DC to each of the RS-422
port built in the main unit and the FX
If both devices are used continuously, their life may be shortened due to heat generation.
<Configuration example 1>
RS-422 port built-in main unit + GT1020LBL (5V DC type)
FX -422-BD + GT1020LBL (5V DC type)
3G
Avoid continuous use of two GT1020LBL (5V DC type) units.
- When connecting a device (such as GOT) which consumes an internal 5V DC to each of two FX
BD units connected to the (40-point/60-point type) main unit, avoid continuous use of either device.
If both devices are used continuously, their life may be shortened due to heat generation.
<Configuration example 2>
When connecting the 40-point type main unit and two FX
FX -422-BD + GT1020LBL (5V DC type)
3G
FX -422-BD + GT1020LBL (5V DC type)
3G
Avoid continuous use of two GT1020LBL (5V DC type) units.
- It is not allowable to connect a device (such as GOT) which consumes an internal 5V DC to each of the
RS-422 port in the (40-point/60-point type) main unit and two FX
the same time.
56
Extension block
Main unit (some blocks can
be connected)
Power supply
from main unit
Refer to Section 6.5.
→ For details, refer to 6.6 Expansion of FX2N Series I/O Powered Extension Unit.
→ For details, refer to 6.7 Expansion of Extension Power Supply Unit (FX3U-1PSU-5V).
-422-BD
3G
Input/output
Extension block
powered
(some blocks can
extension
be connected)
unit
Power supply from
input/output powered
extension unit
Refer to Section 6.6.
→ For details, refer to 6.5 Expansion of Main Unit.
-422-BD at the same time, avoid continuous use of either device.
3G
-422-BD units
3G
6 Examination of System Configuration
6.2 Rules of System Configuration
Extension Extension block
power supply (some blocks can
unit be connected)
Power supply from
extension power
supply unit
Refer to Section 6.7.
-422-BD units (3 channels in total) at
3G
*1
-422-
3G