Specifications

IP 240 Module Description and Accessories
Data for rated voltage 5 V 24 V
symmetrical
pulse train
Input voltage
ranges to RS 422 A
”0”-Signal - 30to+ 5.0 V
”1”-Signal +16 to+ 30 V
Input currents to RS 422 A
”0” signal - 16to+ 1.9 mA
”1” signal + 6 to+ 13 mA
”1” signal typ. 8.5 mA
Edge steepness of the
input signals min. 5 V/µs min. 10 mV/µs
Perm. quiescent current
for ”0” signal max. 1.5 mA
Delay time of the
input circuit 0.8 to 4 µs
Input resistance 2.6 k
Length of shielded
and twisted-pair cable max. 30 m (100 ft) max. 100 m (325 ft)
Input circuit Fig. 2-2a. Fig. 2-2b.
Fig. 2-2. Block Diagram of the Input Circuit for Encoders to RS 422 A
Counter
chip,
wire-
break
moni-
toring
Counter
chip,
firm-
ware level
evaluation
Shield
4.7k
E
5 V
E
E: A/A, B/B, Z/Z
5 V
Shield potential
4.7k
470
Shield potential
M
int
M
int
+
E: A*, B*, Z*,
IN, CLK, GT
E
1nF
24 V
1
M
220pF
Shield
2k
560 33k
26LS32
2,7nF
150
a) Encoders to RS 422 A (symmetrical pulse train) b) 24 V encoder
3.3nF
1
Inputs A*, B*, Z*, IN, CLK and GT must be set to 24 V level on coding switches S5 and S6 ( Section 5.3.2).
EWA 4NEB 811 6120-02 2-5