1.3.2
Components of the MELSEC ST Series
NOTE
A base module is required for mounting each ST series electronics module, except for the
head station.
* Base modules with screw clamp terminals and base modules with spring clamp terminals
cannot be used together in one system. Use either one of them.
1.3.3
Notes on System Setup
Operation of the
ST1PSD
power distribution module is possible in two different modes: In “H”
mode, 24 V DC is made available to supply the head station and the I/O modules, as well as 5 V
DC for the backplane bus. In “R” mode only the internal backplane bus is supplied with 5 V DC.
The mode (H or R) is selected by using different base modules that are identified by the letters
“H” or “R” in the type designation.
At least one ST1PSD is required in “H” mode in order to operate an ST series station. This is
installed on the right side of the head station. Additional power supplies ( with the “R” base mod-
ule) are only required if power consumption of the installed ST modules exceeds the capacity a
single power distribution module.
Introduction
MELSEC ST Series
9
Product
Elektronic
module
Description
Applicable base modules*
Spring clamp
terminals
Screw clamp
terminals
Head station
ST1H-PB
For connection to the
PROFIBUS
Not necessary
Not necessary
Power
distribution
modules
Bus refreshing module
ST1PSD
For powering the head
station
(Supply of 5 V DC and
distribution of 24 V DC)
ST1B-S4P2-H-SET
ST1B-E4P2-H-SET
For increasing the capac-
ity of the 5 V DC supply
ST1B-S4P2-R-SET
ST1B-E4P2-R-SET
Power feeding module
ST1PDD
Distribution of 24 V DC to
the I/O modules
ST1B-S4P2-D
ST1B-E4P2-D
Digital
I/O modules
Input modules
(Negative common type)
ST1X2-DE1
2 inputs, 24 V DC
ST1B-S4X2
ST1B-E4X2
ST1X4-DE1
4 inputs, 24 V DC
ST1B-S6X4
ST1B-E6X4
ST1X16-DE1
16 inputs, 24 V DC
ST1B-S4X16
ST1B-E4X16
Output modules
ST1Y2-TE2
2 transistor outputs, 24 V
DC, 0,5 A, source type
ST1B-S3Y2
ST1B-E3Y2
ST1Y16-TE2
16 transistor outputs,
24 V DC, 0,5 A, source
type
ST1B-S3Y16
ST1B-E3Y16
ST1Y2-TPE3
2 transistor outputs,
24 V DC, 1 A, source
type, short circuit
protected
ST1B-S3Y2
ST1B-E3Y2
ST1Y16-TPE3
16 transistor outputs,
24 V DC, 1 A, source
type, short circuit pro-
tected
ST1B-S3Y16
ST1B-E3Y16
ST1Y2-R2
2 contact outputs
240 V AC / 24 V DC, 2 A
ST1B-S4IR2
ST1B-E4IR2
Intelligent func-
tion modules
Analog input modules
ST1AD2-V
2 voltage inputs
ST1B-S4IR2
ST1B-E4IR2
ST1AD2-I
2 current inputs
Analog output modules
ST1DA2-V
2 voltage outputs
ST1DA1-I
1 current output