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Technical equipment of TC600 PLC
15
TXV 138 08.02
4.4.1.3 Interface RS-422
Interface RS-422 of PLC's of the TC600 series ensures conversion of
output signals of the TTL level to level defined by the specification V.11
(X.27, EIA RS-422), and input signals according to V.11 to the TTL level.
Parameters of symmetric binding circuits of the RS-422 interface allow for
two-point connection of end devices in the duplex mode. It is suitable for
connection realised in medium distance in an environment with higher level
of electromagnetic disturbances.
For the communication, PLC's of the TC600 series use only binding cir-
cuits of signals TxD (Transmit Data) and RxD (Receive Data) of the RS-422
interface.
Transmission speed
max. 230.4 kBd
1)
Cable length
max. 1200 m
2)
Sensitivity of the differential input
RxD+, RxD-
±200 mV
Input resistance of the differential
input RxD+, RxD-
min. 12 k
Voltage of the differential input
RxD+, RxD- for level 1
min. 0.2 V
max. 12 V
Voltage of the differential input
RxD+, RxD- for level 0
min. -0.2 V
max. -7 V
Voltage of the differential output
TxD+, TxD- for level 1
max. 5 V
Io=0)
2.3 V (R
l
=100
Voltage of the differential output
TxD+, TxD- for level 0
max. -5 V
Io=0)
-2.3 V (R
l
=100
Difference of the output voltage
value for levels 0 and 1
max. ±0.2 V
Output current
max. ±60 mA
1)
The maximum transmission speed is limited by the maximum allowed
transmission speed of the set mode of the communication channel.
2)
The maximum cable length may only be used provided that the maxi-
mum transmission speed is reduced.
Interface RS-422 is
used for two-point
connection
Parameters of the
RS-422 interface