Siemens SIMATIC S7-300 Series Reference Manual page 67

Technical Specifications of the Analog Inputs of the CPU 314IFM
Module-Specific Data
Number of inputs
Cable length
S
Shielded
Voltages, Currents, Potentials
Galvanic isolation
S
between channels and
backplane bus
Permissible potential
difference
S
between inputs and
M (U )
ANA CM
S
between M and
ANA
M (U )
internal ISO
Insulation tested at
Analog Value Generation
Measurement principle
Conversion time/Resolution
(per channel)
S
Basic conversion time
S
Resolution (inc.
overdrive range)
Interference Suppression, Error Limits
Interference voltage
suppression
S
Common-mode
interference (U <1.0
CM
V)
Crosstalk between the
inputs
Operational error limits
(throughout temperature
range, relative to input
range)
S
Voltage input
S
Current input
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Interference Suppression, Error Limits, Conti-
nued
4
Basic error limits
(operational limit at 25°C,
max. 100 m (109yd.)
relative to input range)
S
Voltage input
S
Current input
Yes
Temperature error (referred
to input range)
Linearity error (referred to
1.0V DC
input range)
Accuracy of reproducibility
75V DC
(in transient state at 25°C,
60V AC
referring to input range)
Status, Interrupts, Diagnostics
500V DC
Interrupts
Diagnostic functions
Momentary value
encoding
Sensor Selection Data
(successive
Input ranges
approximation)
(rated value)/input
resistance
S
Voltage
100 ms
S
Current
11 bits + sign bit
Permissible input voltage
for voltage input
(destruction limit)
> 40 dB
Permissible input current for
current input (destruction
limit)
> 60 dB
Connecting signal
generators
S
for voltage
measurement
S
for current
" 1.0 %
measurement
" 1.0 %
as 2-pole measurement
transducer
as 4-pole measurement
transducer
CPUs
" 0.9 %
" 0.8 %
"" 0.01 %/K
" 0.06 %
" 0.06 %
None
None
"" 10 V/50 kW
"" 20 mA/105.5 W
max. 30 V
continuous;
38 V for max. 1 s
(pulse duty factor
1:20)
34 mA
Possible
Not possible
Possible
1-51