About the PS 4-271
Compact PLC
8
06/99 AWB 2700-1364 GB
Elements of the
PS 4-271
Power supply unit
The PS 4-271 requires a power supply rated at
120/240 V AC.
Digital inputs
The PLC has 12 digital inputs. These are electrically
isolated from the CPU and designed for a rated
voltage of 120/240 V AC. The inputs I0.0 to I0.7 and
I1.0 to I1.3 can be addressed in bits, bytes or words.
Three different external cables can be connected to
the groups of input. Only one external cable should
be used for each group..
The two neutral conductor terminals N1/N2 are
isolated.
,
Status LEDs for analog outputs
LEDs for inputs I0.0 to I0.7 indicate the physical,
logical states of the signal inputs, as well as the
diagnostic status word of the PLC (see the section
entitled "Description of the diagnostic status word"
on Page 67).
Plug-in screw terminal
Please refer to the chapter “Engineering” for a
summary of terminals for the digital and analog
inputs/outputs.
,
Analog inputs
The PLC has 4 analog inputs. You can configure
inputs AI
0
and AI
1
as voltage inputs (0 to 10 V) or
current inputs (0(4) to 20 mA). The inputs AI
2
and AI
3
are provided for connecting temperature sensors
such as Pt1000 or Ni1000. All inputs have a
resolution of 10 bits (1024 increments).
Group
External cable
I0.0 to 0.3
1
I0.4 to I0.7 and I1.0
2
I1.1 to I1.3
3
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