Siemens SIMATIC ET 200SP Manual page 20

Wiring
3.1 Pin assignment
L+/M supply voltage
Connect the supply voltage (DC 24V) to the L+ and M connections. An internal protective
circuit protects the technology module from polarity reversal of the supply voltage. The
technology module monitors the connection of the supply voltage.
24VDC encoder supply
To supply the encoder and sensors at the digital inputs, the technology module supplies the
DC 24V supply voltage at the 24VDC output with reference to M. Voltage is supplied from
the L+/M supply voltage and monitored for short circuits and overload.
24 V encoder signals/count signals
The 24 V encoder signals are designated A, B and N. You can connect the following encoder
types:
● Incremental encoder with signal N:
● Incremental encoder without signal N:
● Pulse encoders without direction signal:
● Pulse encoders with direction signal:
● Pulse encoders with counting signal up/down:
The inputs are not electrically isolated from each other. The inputs are isolated against the
backplane bus.
20
The signals A, B and N are connected by means of the correspondingly labeled
terminals. Signals A and B are the two incremental signals phase-shifted by 90°. N is the
zero mark signal which returns one pulse per revolution.
The signals A and B are connected by means of the correspondingly labeled terminals.
Signals A and B are the two incremental signals phase-shifted by 90°. The N terminal
remains disconnected.
The counting signal is connected to the A terminal. The count direction is specified via the
control interface. The B and N terminals remain disconnected.
The counting signal is connected to the A terminal. The direction signal is connected to
the B terminal. The N terminal remains disconnected.
The up counting signal is connected to the A terminal. The down counting signal is
connected to the B terminal. The N terminal remains disconnected.
Technology Module TM Count 1x24V (6ES7138‑6AA00‑0BA0)
Manual, 10/2013, A5E33002339-AA