July 2010 11 – 149
11.6.4 PLC outputs
Output signals and
addresses
The switching outputs are transistor outputs with current limitation.
Please note:
Permissible load: Resistive load (inductive load only with quenching diode parallel to
inductivity).
MC 42x (B/C), PL 4xxB: Short circuiting of one output is permissible.
No more than one output may be short-circuited at one time.
PLD 16-8: The outputs are short-circuit proof.
The output voltage for the "1" signal must not be more than 3 V below the measured 24 V
supply voltage (e.g., 22.7 V - 3 V = 19.7 V).
The switching outputs need a minimum load of 5 mA.
They conform to EN 61131-2.
Addresses:
Which PLC output is located on which pin of the connector?
--> See “Connector Designation and Layout” on page 27 – 447!
Supply voltage for
PLC outputs
EN 61 131-2:1994 permits:
5% alternating voltage component is permissible
Minimum absolute value: 20.4 V–
Maximum absolute value: 28.8 V–
See “Power Supply for PLC Outputs” on page 17 – 268.
PLC outputs must neither be connected to a 24-V supply, nor to other PLC outputs with a
difference in potential. Otherwise, the voltage present at the PLC outputs is transmitted to
the power supply. As a result, the PLC outputs that can be switched off may nevertheless
be supplied with this voltage.
This could lead to damage or injury to property or persons!
Address Quantity Device
O0 to O30 31 PLC outputs directly on the MC, connector X41
O0 to O7 8 Machine operating panel (MC, X46)
O32 to O62 31 First PLC input/output unit (MC, X47)
O64 to O94 31 Second PLC input/output unit
O96 to O111 16 Handwheels HR 410, HR 332 and HRA 110 (MC, X23)
O128 to O158 31 Third PLC input/output unit
O160 to O190 31 Fourth PLC input/output unit
The transmission of output states of handwheels and PLC input/output units (expansion
cards) is performed with HEIDENHAIN serial data transmission busses on the connectors
X23 and X47.
On the X41 and X46 connectors, each output has its own wire.
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