Technical equipment of TC600 PLC
45
TXV 138 08.02
9.5 Connection of the PLC Inputs and Outputs
With the exception of the protective grounding connector and the CH1
RS-232 interface, PLC inputs and outputs are connected using removable
terminal boards which are inserted into the appropriate socket plugs of in-
puts and outputs. The screw part of the terminal board is constructed for
connection of a full conductor with cross section up to 1.5 mm
2
or a wire
with cross section up to 1 mm
2
. The minimum recommended cross section
of the full conductor is 0.2 mm
2
, of the wire 0.5 mm
2
. Terminal boards are a
part of the PLC additional package.
Connection terminal boards are not protected against ex-
change by any coding element, check the connection be-
fore putting them into operation!
9.5.1
Connection of the Protective Connector
The PLC protective connector must be interconnected with the inside
protective connector of the case. Interconnection must meet requirements
* +,
IEC 364-5-54:1980). From the viewpoint of dis-
turbances, in cases with the metal mounting board it is suitable to connect
the protective terminal board with the mounting board by the shortest con-
nection possible. The protective connector is marked with the label 417-IEC-
5019-a
.
9.5.2
PLC Power Supply
Power supply of the PLC, input and output circuits, must be in the over-
-
33 0420 (eqv IEC 664:1980,
IEC 664A:1981).
The power supply must meet conditions of the SELV supply according to
++, $+++.//01
Between the primary and secondary winding of the transformer, a Cu
shielding foil must be wound up, connected with the inside protective termi-
nal board of the case or the winding must be arranged spatially in such a
way so that the mutual capacity between the windings is minimized. It is
suitable to insert switches into the supply lead which make work on program
debugging, maintenance and possible repairs easier.
The power supply voltage of the PLC, 24 V~ ±20%, 50 - 60 Hz ±5% or
24 V- ±20 %, is connected to connectors M1 and M2 of the terminal board
marked as POWER INPUT. In connection of the direct-current supply, volt-
age polarity does not matter. Permanent exceeding of the tolerance upper
limit may cause breaking of the voltage protective element of the PLC con-
verter. For dimensioning of the supply, it is necessary to consider the
maximum input of 13 W (20 VA), which also contains input of coils of the
relay of binary relay outputs.
Switches of input circuits may be supplied from the same power supply
as the BM internal converter. Input of the closed binary input is typically
0.25 W (0.25 VA). For connection of the binary inputs supply see item 9.5.3.
Circuits closed by binary outputs must be supplied from an independent
power supply or at least from an independent transformer winding. The sup-
ply must be dimensioned according to the concrete input of the loads. Input
of the output transistor circuit is typically 0.2 W for current of 1 A. For con-
nection of the binary outputs power supply see items 9.5.4 and 9.5.5.
PLC power supply
can also be used for
supplying of binary
inputs
