Siemens SIMATIC ET 200eco PN - Page 162

I/O device analog input/analog output
10.1 I/O device analog input
ET 200eco PN
162 Operating Instructions, 08/2016, A5E01250250-AJ
Technical data
Electrical isolation
• Between 1L+ and 2L+
Yes
• Between 1L+, channels and all other circuit
elements
No
• Between channels
No
• Between Ethernet and all other circuit ele-
ments
Yes
1
"No temperature compensation" is always run when using the measuring type ±80 mV regardless of
the configured temperature compensation.
2
With 3-wire resistance measurement (and thermal resistor) the measuring resistances and the line
resistances are updated in alternating cycles. Rapid changes in the measuring resistance therefore
impair the accuracy.
3
For thermocouples, the information refers to the temperature range from -100 °C to nominal value
Note
The accuracy information is valid for static thermal states and changes in ambient
temperature < 1
K/h.
The I/O device achieves the highest accuracy w
ith the 4-wire connection system (see
technical specifications above).
Although the 3
-wire connection system compensates for the missing wire, the accuracy is
impaired. With the 2
-wire connection system, the line resistances considerably impair the
accurac
y.
In the last two cases this impairment is not determinable.
Note
With the 3
-wire connection system, the compensation of the missing cable is only ensured if
all three cores in the cable have the same length and cross
-section.
See also
Response times for analog input device and output device (Page 258)