Analog Modules
4-159
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Table 4-81 Parameters of the SM 331; AI 2 x 12 bits, continued
Parameter ScopePara-
meter
Type
Default
Settings
Value Range
Measurement
• Measuring Method Deactivated
U Voltage
4DMU Current (4-wire transmitter)
2DMU Current (2-wire transmitter)
R-4L Resistance (four-conductor
connection)
RTD-4L Bulb resistor
(linear, four-conductor
connection)
TC-I Thermocouple
(internal comparison)
TC-E Thermocouple
(external comparison)
TC-IL Thermocouple
(linear, internal comparison)
TC-EL Thermocouple
(linear, external comparison)
U
Dynamic
Channel o
Channel
group
• Measuring Range Refer to Section 4.25.2 for the
measuring ranges of the input
channels that you can set.
"10 V
• Interference
Suppression
400 Hz; 60 Hz; 50 Hz; 10 Hz 50 Hz
Channel groups
The two channels of the analog input module SM 331; AI 2 x 12 bits are combined
to a channel group. You can only ever assign parameters to the channel group.
The SM 331; AI 2 x 12 bits has a measuring range module for the channel group 0.
Special characteristic of channel groups with resistance measurement
If you use the resistance measurement method, the analog input module has only
one channel. The “2nd” channel is used for current injection (I
C
).
The measured value is obtained by accessing the “1st” channel. The “2nd” channel
has the default carry value “7FFF
H
”.
Special characteristic of channel groups for hardware interrupts
You can set a hardware interrupt in STEP 7 for the channel group. Note, however,
that a hardware interrupt is set only for the first channel in the channel group in
each case – in other words, for channel 0.
Diagnostics
You will find the diagnostic messages that are grouped under the “group diagnosis”
parameter in Table 4-46, on page 4-72.
To Next Page
Loading...
Need help?
General
