HEIDENHAIN TNC 426 PB - Page 130

3 – 48 HEIDENHAIN Technical Manual TNC 426, TNC 430
X48: Analog input
(PLC) on the logic
unit
Pin layout:
X15 to X18: Analog
input on the
PL 410B
Pin layout:
Warning
Remember to connect the analog inputs with the correct polarity!
Note
The interface complies with the requirements of EN 50 178 for “low
voltage electrical separation.”
D-sub connection
(female) 25-pin
Assignment
1I
1
+ Constant current for Pt 100
2I
1
– Constant current for Pt 100
3U
1
+ Measuring input for Pt 100
4U
1
– Measuring input for Pt 100
5I
2
+ Constant current for Pt 100
6I
2
– Constant current for Pt 100
7U
2
+ Measuring input for Pt 100
8U
2
– Measuring input for Pt 100
9I
3
+ Constant current for Pt 100
10 I
3
– Constant current for Pt 100
11 U
3
+ Measuring input for Pt 100
12 U
3
– Measuring input for Pt 100
13 Do not assign
14 Analog input 1: –10 V to +10 V
15 Analog input 1: 0 V (reference potential)
16 Analog input 2: –10 V to +10 V
17 Analog input 2: 0 V (reference potential)
18 Analog input 3: –10 V to +10 V
19 Analog input 3: 0 V (reference potential)
20 to 25 Do not assign
Housing External shield
Connecting
terminals
Assignment
1 -10 V to +10 V
2 0 V (reference potential)
3 Shield