5 - 7 5 - 7
5 POWER DISTRIBUTION MODULES
MELSEC-ST
(b) Example of 24VDC current calculation
If the total 24VDC current exceeds the maximum rated current (I/O
modules: 8.0A, Intelligent function modules: 3.0A) of
the bus refreshing module, mount a new power feeding module (or bus
refreshing module).
ST1X4-DE1
ST1H-BT
ST1PSD
*1
ST1X4-DE1
ST1X4-DE1
ST1X4-DE1
ST1X4-DE1
ST1Y16-TE2
ST1Y16-TE2
ST1Y16-TE2
ST1Y16-TE2
ST1Y16-TE2
ST1Y2-R2
ST1PSD
ST1DA2-V
ST1DA2-V
ST1DA2-V
ST1DA2-V
System configuration example
External devices: 20 sensors
External devices: 80 loads (lamps)
External devices:
2 loads
In the above system configuration, consider the following 24VDC currents for
calculation.
The 24VDC currents of the output circuits of the transistor output modules (ST1Y16-
TE2) need not be included in this calculation since they can be ignored.
Consider inrush currents when inductive loads, lamp loads or capacitive loads are
connected to the contact output modules.
Item Description
Load current of external device
Indicates the load current of an external device
(sensor, lamp, etc.). For the current consumption of a
user-prepared device, refer to the manual of the
corresponding device.
Rated input current
Indicates the input current of the input module
(ST1X4-DE1). Refer to Chapter 7 for the rated input
current of the corresponding input module.
External AUX. power supply (for relay
load) current
Indicates the current flowing in the relay coil of the
contact output module (ST1Y2-R2). The current
flowing in the relay contact need not be considered.
Refer to Chapter 7 for the external AUX. power
supply (for driving relay) current.
24VDC current consumption
Indicates the 24VDC current of the intelligent function
module (ST1DA2-V).
For the current value, refer to the manual of the
corresponding intelligent function module.
Summary of Contents for MELESEC-ST
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Page 114: ...10 22 10 22 10 MOUNTING AND INSTALLATION MELSEC ST MEMO...
Page 125: ...11 11 11 11 11 EMC AND LOW VOLTAGE DIRECTIVE MELSEC ST MEMO...
Page 163: ...Index 2 Index 2 MEMO Ind...
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