Analog Modules - Analog input SM 331 Overview z Analog inputs z For connection of voltage and current sensors, thermocouples, resistors and resistance thermometers Application Analog
Trang 1Analog Modules - Analog input SM 331
Overview
z Analog inputs
z For connection of voltage and current sensors, thermocouples, resistors and resistance thermometers
Application
Analog input modules can be used to connect the PLC to analog process signals They are suitable for the connection of voltage and current sensors, thermocouples, resistors and resistance thermometers
Function
The analog input modules convert analog signals from the process into digital signals for processing within the PLC
The modules feature:
z Resolution from 9 to 15 bits + sign (for different conversion times), configurable
z Different measuring ranges;
the basic current/voltage range settings are adjusted mechanically via measurement range modules Fine adjustments are made with the STEP 7 Hardware Configuration tool on a PG
z Interrupt capability;
the modules transmit diagnostic and limit value interrupts to the programmable controller’s CPU
z Diagnostics;
the module sends detailed diagnostic information to the CPU
Technical specifications
Reverse polarity protection Yes Yes Yes
Trang 2z from load voltage L+ (no load),
max
z from backplane bus 5 V DC,
max
z Power dissipation, typical 1 W 1.5 W 0.4 W 1.3 W
z Requisite front connector 20-pin 20-pin 40-pin 20-pin
z Clock synchronous operation No Yes No No
z Number of analog inputs for
resistance measurement
z Length of cable shielded, max 200 m; 50 m at 80 mV and
thermocouples
200 m 200 m; max 50 m at 50 mV 200 m; 50 m at 80 mV and
thermocouples
z Permiss input voltage for voltage
input (destr limit), max
20 V; permanent; 75V for max 1s (pulse duty ratio 1:20)
20 V; 20 V permanent, 75 V for max
1 s (pulse duty ratio 1:20)
30 V; 12 V continuous, 30 V for max
1 s
20 V; permanent; 75V for max 1s (pulse duty ratio 1:20)
z Perm input volt for the current
input (destr lim.), max
Input ranges (rated values), voltages
Input ranges (rated values), currents
Input ranges (rated values),
thermocouples
Input ranges (rated values),
resistances
Input ranges (rated values),
resistance thermometer
Ni 100 Yes; Standard Yes; Standard/climate Yes
Pt 100 Yes; Standard Yes; Standard/climate Yes
Characteristic curve linearization
for thermocouples Type N, E, J, K, L Type N, E, J, K, L
for resistance thermometer Pt 100 (standard range, climatic
range), Ni 100 (standard range, climatic range)
yes; Pt100 standard/climatic; Ni100
standard/climatic; Ni1000 standard/climatic; LG-Ni1000 standard/climatic
Pt 100 (standard range, climatic range), Ni 100 (standard range, climatic range)
external temperature
compensation with
compensating box possible
internal temperature
compensation possible
z Measuring principle integrating Conversion of instantaneous values integrating integrating
Integration and conversion
time/triggering per channel
with over-range (bits incl
sign), max
15 Bit; unipolar: 9 / 12 / 12 / 14 bits, bipolar: 9 + VZ/12 + VZ/12 + VZ/14 +
VZ bits
14 Bit; unipolar: 14 bits; bipolar:
13+VZ bits
13 Bit 15 Bit; unipolar: 9 / 12 / 12 / 14 bits,
bipolar: 9 + VZ/12 + VZ/12 + VZ/14 +
VZ bits Integration time
parameterizable
Yes; 2.5 / 16.67 / 20 / 100 ms Yes Yes; 60 / 50 ms Yes; 2.5 / 16.67 / 20 / 100 ms Basic conversion time incl 3/ 17/ 22/ 102 ms 66 / 55 ms 6/ 34/ 44/ 204 ms
Trang 3integration time, ms
Basic conversion time, ms 52 µs per channel 66 / 55 ms
Interference voltage suppr
for interference frequency f1
in Hz
400 / 60 / 50 / 10 Hz 400 / 60 / 50 / 10 Hz 50 / 60 Hz 400 / 60 / 50 / 10 Hz
for current measurement, as
2-wire measuring transducer
Yes Yes Yes; with extreme power supply Yes for current measurement, as
4-wire measuring transducer
for resistance measurement,
with 2-wire connection
for resistance measurement,
with 3-wire connection
for resistance measurement,
with 4-wire connection
Operational limit in the entire
temperature range
relative to the input range,
voltage
+/- 1 %; +/-1% (80 mV), +/-0.6%
(250-1000 mV), +/-0.8% (2.5-10 mV)
+/- 0,4 % +/- 0,6 %; +/-0.6%
5V,10V,1-5V,0-10V; +/-0.5% (+/-50mV,500mV,1V
+/- 1 %; +/-1% (80mV),+/- 0.6% (250-1000mV),+/- 0.8% (2.5-10V) relative to the input range,
current
+/- 0,7 %; from 3.2-20mA +/- 0,3 % +/- 0,5 %; +/-20mA,0-20mA,4-20mA +/- 0,7 %; from 3.2 to 20mA relative to the input range,
resistance
+/- 0,7 %; 150, 300, 600 ohms +/- 0,5 %; 0-6kOhms, 0-600kOhms +/- 0,7 %; 150, 300, 600 ohms relative to the input range,
resistance thermometer
+/- 0,7 %; +/-0.7% (Pt100/ Ni100) +/-0.8% (Pt100 climat)
1 Kelvin (Pt100,Ni100,climatic;
Ni1000,LG-Ni1000,standard;
Ni1000,LG-Ni1000,climatic); 1.2 Kelvin (Pt100,Ni100,standard)
+/- 0,7 %; +/-0.7% (Pt100/ Ni100) +/-0.8% (Pt100 climat)
Basic error limit (operational limit at
25 °C)
relative to the input range,
voltage
+/- 0,6 %; +/-0.4% (250-1000mV) +/-0.6% (2.5-10mV)
+/-0.7% (80mV)
+/- 0,25 % +/- 0,4 %; 0.4%
(+/-5V,10V,1-5V,0-10V);
0.3% (+/-50mV,500mV,1V)
+/- 0.6 %; +/-0.6% (80mV, 2.5-10V) +/-0.4% (250-1000mV)
relative to the input range,
current
+/- 0,5 %; 3.2-20 mA +/- 0,2 % +/- 0,3 %; +/-20mA,0-20mA,4-20mA +/- 0,5 %; 3.2-20 mA relative to the input range,
resistance
+/- 0,5 %; 150, 300, 600 ohms +/- 0,3 %; 0-6kOhms,0-600kOhms +/- 0,5 %; 150, 300, 600 ohms relative to the input range,
resistance thermometer
+/- 0,6 %; +/-0.5% (Pt100/ Ni100) +/-0.6% (Pt100 climatic)
1 Kelvin (Pt100,Ni100,standard)
0.8 Kelvin (Pt100,Ni100,climatic;
Ni1000,LG-Ni1000,standard;
Ni1000,LG-Ni1000,climatic)
+/- 0.6 %; +/-0.5% (Pt100/ Ni100) +/-0.6% (Pt100 climatic)
Status information/ interrupts/
diagnostics
Diagnostic interrupt Yes; parameterizable channels 0 and
2
Yes; parameterizable No Yes Limit value interrupt Yes; parameterizable Yes; parameterizable channels 0 and
2
No Yes; parameterizable; channel 0
Diagnostic information can
be read out
z Insulation tested with 500 V DC 500 V DC 500 V DC 500 V DC
between the channels, in
groups of
between the channels and
the backplane bus
Reverse polarity protection Yes Yes Yes
z from load voltage L+ (no load),
max
Trang 4z from backplane bus 5 V DC,
max
z Power dissipation, typical 4.6 W 3 W 0.6 W 3 W
Connection system
z Requisite front connector 40-pin 40-pin 40-pin Clock synchronism
z Clock synchronous operation No No No No Analog inputs
z Number of analog inputs 8 8 8 8 z Number of analog inputs for resistance measurement 8
z Length of cable shielded, max 200 m 100 m 200 m 200 m z Permiss input voltage for voltage input (destr limit), max 75 V 75 V 50 V 75 V z Perm input volt for the current input (destr lim.), max 32 mA 40 mA Input ranges (rated values), voltages
1 to +5 V Yes Yes -10 V to +10 V Yes Yes -5 V to +5 V Yes Yes Input ranges (rated values), currents
0 to 20 mA Yes Yes -20 to +20 mA Yes Yes 4 to 20 mA Yes Yes Input ranges (rated values), thermocouples
Type B Yes
Type E Yes
Type J Yes
Type K Yes
Type L Yes
Type N Yes
Type R Yes
Type S Yes
Type T Yes
Type U Yes
Input ranges (rated values), resistances
0 to 150 ohms Yes
0 to 300 ohms Yes
0 to 600 ohms Yes
Input ranges (rated values), resistance thermometer
Cu 10 Yes
Ni 100 Yes
Ni 1000 Yes
Ni 120 Yes
Ni 200 Yes
Ni 500 Yes
Pt 100 Yes
Pt 1000 Yes
Pt 200 Yes
Pt 500 Yes
Characteristic curve linearization
parameterizable Yes Yes
for resistance thermometer Pt 100, Pt 200, Pt 500, Pt 1000, Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000, Cu 10 (standard/climatic)
Temperature compensation
parameterizable Yes
external temperature compensation with compensating box possible Yes
external temperature compensation with Pt100 Yes
internal temperature compensation possible Yes
Analog value formation
z Measuring principle integrating integrating integrating Integration and conversion time/triggering per channel with over-range (bits incl
sign), max
16 Bit; Two's complement 16 Bit 16 Bit; unipolar: 15 / 15 / 15 / 15 bits,
bipolar: 15 + VZ/15 + VZ/15 + VZ/15 + VZ
16 Bit; unipolar: 15 / 15 / 15 / 15 bits, bipolar: 15 + VZ/15 + VZ/15 + VZ/15 + VZ
Integration time
parameterizable
Yes Yes Yes; 10 / 16,67 / 20 / 100 ms Yes; 23 / 72 / 83 / 95 ms Basic conversion time, ms up to 4 channels: 10 ms per module,
as of 5 channels: 190 ms per module,
10 ms (4-channel mode) 95 / 83/ 72/
23 ms (8-channel mode)
Trang 58 channels: 80 ms Interference voltage suppr
for interference frequency f1
in Hz
400 / 60 / 50 Hz 400 / 60 / 50 / 10 Hz 400 / 60 / 50 Hz, combinations of 400,
60, 50 Hz
for current measurement, as
2-wire measuring transducer
for current measurement, as
4-wire measuring transducer
for resistance measurement,
with 2-wire connection
for resistance measurement,
with 3-wire connection
for resistance measurement,
with 4-wire connection
Operational limit in the entire
temperature range
relative to the input range,
voltage
relative to the input range,
current
relative to the input range,
resistance
Basic error limit (operational limit at
25 °C)
relative to the input range,
voltage
relative to the input range,
current
relative to the input range,
resistance
Status information/ interrupts/
diagnostics
Diagnostic interrupt Yes; parameterizable per group Yes Yes; parameterizable Yes; parameterizable
Limit value interrupt Yes; parameterizable Yes Yes; parameterizable channels 0 and
2
Yes; parameterizable all channels (end-of-cycle interrupt also supported throughout modules)
Diagnostic information can
be read out
z Insulation tested with 500 V DC 500 V DC 500 V AC
between the channels, in
groups of
between the channels and
the backplane bus