The volume of data that is exchanged between slave and master station depends on the mode
that has been set:
2.2.2
Power Distribution Modules
Specifications
MELSEC ST Series
13
Item
ST1PSD
ST1PDD
SYS.
Rated input voltage
24 V DC
—
Rated allowable voltage
24 V DC
±
20 %,
ripple ratio within 5 %
Max. rated input current at 24 V DC
0.7 A
Output
5 V DC, maximum 2.0 A
Efficiency
≥
80 %
AUX.
Rated input voltage
24 V DC
Rated allowable voltage
24 V DC
+
20/ -15 %, ripple ratio within 5 %
Max. rated input current at 24 V DC
0.7 A
—
Output
24 V DC, max. 8.0 A
Dielectric withstand voltage
500 V AC for 1 minute,
600 V AC for 1 s across SYS. inputs and AUX. inputs
Insulation resistance
≥
10 M
Ω
across SYS. inputs and AUX. inputs
(Checked with 500 V DC insulation resistance tester)
Noise durability
Checked with noise simulator (Peak-to-peak noise voltage: 500 V,
noise width/noise frequency: 1
µ
s/25 to 60 Hz)
First transient noise compliant to IEC61000-4-4: 2 kV
Indication of operating status
LED "SYS": Indicates that
5 V DC are output
—
LED "AUX": Indicates that 24 V DC are output
Number of occupied slices (Width)
2 slots (25.2 mm)
1 slot (12.6 mm)
Number of occupied I/O points
2 inputs and 2 outputs
Internal power consumption (5 V DC)
—
0.06 A
Weight
0.06 kg
0.03 kg
Item
32-point mode
64-point mode
128-point mode
256-point mode
Input
Output
Input
Output
Input
Output
Input
Output
Bit I/O points
32 bits
32 bits
64 bits
64 bits
128 bits
128 bits
256 bits
256 bits
Word I/O points
(variable)
max.
52 words
max.
52 words
max.
52 words
max.
52 words
max.
52 words
max.
52 words
max.
32 words
max.
32 words
Request/Informa-
tion area
14 bytes
14 bytes
20 bytes
20 bytes
32 bytes
32 bytes
56 bytes
56 bytes
Total
max.
122 bytes
max.
122 bytes
max.
132 bytes
max.
132 bytes
max.
152 bytes
max.
152 bytes
max.
152 bytes
max.
152 bytes