Addresses Of The High-Speed Counters - Siemens Simatic S7-1500 CPU 1512C-1 PN User Manual

Wiring
4.3 Terminal and block diagrams
4.3.4

Addresses of the high-speed counters

You connect the encoder signals, the digital input and output signals and the encoder
supplies to the two 40-pin front connectors of the digital on-board I/O. For information on
wiring the front connectors, establishing the cable shields, etc., refer to the S7-1500,
ET 200MP (http://support.automation.siemens.com/WW/view/en/59191792) system manual.
Encoder signals
The 24 V encoder signals are designated with letters A, B and N. You can connect the
following encoder types:
● Incremental encoder with signal N:
Signals A, B and N are connected using the correspondingly marked connections.
Signals A and B are the two incremental signals, phase-shifted by 90°. N is the zero mark
signal that supplies a pulse per revolution.
● Incremental encoder without signal N:
Signals A and B are connected using the correspondingly marked connections. Signals A
and B are the two incremental signals, phase-shifted by 90°.
● Pulse encoder without direction signal:
The count signal is connected to the A connection.
● Pulse encoder with direction signal:
The count signal is connected to the A connection. The direction signal is connected to
the B connection.
● Pulse encoder with up/down count signal:
The up count signal is connected to the A connection. The down count signal is
connected to the B connection.
You can connect the following encoders or sensors to the A, B and N inputs:
● Switching to P potential:
The encoder or sensor switches the A, B and N inputs to 24 V DC.
Note
External load resistance
Note that, depending on the characteristics of the signal source, effective load and height
of the signal frequency, you may possibly require an external load resistance to limit the
fall time of the signal from high level to low level.
The specifications/technical data of the signal source (e.g. sensor) are decisive for the
configuration of such a load resistance.
● Push-pull:
The encoder or sensor switches the A, B and N inputs alternately to 24 V DC and to
ground M.
104
CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
Manual, 12/2017, A5E40898741-AA