GPC150 ETC [List of Unclassifed Manufacturers], GPC150 Datasheet - Page 32
![no-image](/images/no-image-200.jpg)
GPC150
Manufacturer Part Number
GPC150
Description
General Purpose Controller Z84C15
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
1.GPC150.pdf
(103 pages)
- Current page: 32 of 103
- Download datasheet (2Mb)
Per il collegamento in Current Loop passivo sono possibili due diversi tipi di collegamento: a 2 fili
ed a 4 fili. Tali connessioni sono riportate nelle figure 19 e 20; in esse é indicata la tensione per
alimentare l’anello (VCL) e le resistenze di limitazione della corrente (R). I valori di tali componenti
variano in funzione del numero di dispositivi collegati e della caduta sul cavo di collegamento;
bisogna quindi effettuare la scelta considerando che:
- si deve garantire la circolazione di una corrente di 20 mA;
- su ogni trasmettitore cadono mediamente 2,35 V con una corrente di 20 mA;
- su ogni ricevitore cadono mediamente 2,52 V con una corrente di 20 mA;
- in caso di cortocircuito sulla rete ogni trasmettitore dissipi al massimo 125 mW;
- in caso di cortocircuito sulla rete ogni ricevitore dissipi al massimo 90 mW.
Per maggiori informazioni consultare il Data-Book HEWLETT-PACKARD, nella parte che
riguarda gli opto-accoppiatori per Current Loop denominati HCPL 4100 e HCPL 4200.
ITALIAN TECHNOLOGY
GPC
®
150
Master
F
IGURA
TX
RX
Rel. 3.00
+
+
-
-
21: E
SEMPIO DI COLLEGAMENTO IN RETE IN
R
R
+
grifo
VCL
®
-
C
URRENT
4
5
2
1
2
1
4
5
4
5
2
1
+
+
+
+
+
+
-
-
-
-
-
-
L
RXB
TXB
RXB
TXB
RXB
TXB
GPC ® 150
GPC ® 150
OOP PASSIVO
GPC ® 150
Slave 1
Slave n
Slave 2
CN2
CN2
CN2
Pagina 25
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