HEIDENHAIN TNC 430 PA/M - Connection to the Analog Inputs

December 2001 Analog Input 3 – 49
X19 to X22:
Connection for Pt
100 on the PL 410B
Pin layout:
Connection to the
analog inputs
Characteristics of the connecting cable:
n Shielding
n 2 conductors with 0.14 mm
2
each
n Maximum length 50 meters
Connection to the
inputs for Pt 100
thermistors
7
77
7 Configure the thermistor connection as a “four-conductor circuit.”
Note
The interface complies with the requirements of EN 50 178 for “low
voltage electrical separation.”
Connecting
terminals
Assignment
1 I + Constant current for Pt 100
2 U + Measuring input for Pt 100
3U – Measuring input for Pt 100
4I – Constant current for Pt 100
5Shield
1
2
4
5
Measuring input U+
Measuring input U–
→
I+
→
I–
Pt100 Customer´s cable
4 x 0.14 mm
2
screened, max 50 m
3