Digital Lnputs(Dl) - Siemens SIMATIC S5 IP 281 Equipment Manual

R 11192
1.4.1.2 5
V Encoder Interface in Accordance with RS 422
The 5 V encoder interface contains the inputs for the three, differential counting signals AJ~, B/E
and N~. A 5.2 V encoder supply is available on the module as an option.
The signal inputs are provided with potential connected to the S5 bus. The
Signal inputs
inputs are potentially isolated from the following.
– Digital inputs
– Digital output
– 24 V
Encoders with two, differential signals displaced by 90° (track A/x, track
nected,
The inputs are equipped with wire break recognition. This can be switched
Wire break
recognition on and off with plug: in jumpers X34/X44.
The wire break recognition detects the following errors.
Wire break on the signal input
Wire break on the inverted signal input
Short circuit between signal input and inverted signal input
Short circuit between signal input and O VI
Short circuit between signal input and 5 VI
1 Is not detected unless the voltage difference between user signal and
ence potential must be set for the S5 bus (-+ sections 1.4.1 and
2.3).
A "
+
e
B
I
5.2 V encoder SU}PIY l—
short circuit <1.1 V.
General Function Description
A
Wire break
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