2-5
SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618
2.3 Ultrasonic Measuring System
A system for ultrasonic position encoding includes the following:
-- S7-300 PLC with CPU and power supply
-- Ultrasonic positioning module SM 338
-- External supply voltage of 24 V
-- Ultrasonic position encoding sensor(s)
Ultrasonic position encoding sensors with the following capabilities can be
used.
S START/STOP interface with RS 422 signals
S Power supply: for all sensors connected simultaneously to the SM 338
-- +
15 V/max. of 200 mA, floating or
-- +24 V/max. of 300 mA, floating
The following sensors are recomm ended for connection to the SM 338.
Table 2-2
Company
Model Supply Remarks
MTS
(Temposonic)
TTM
LP
+15 V/100 mA
15 to 24 V/30 mA
Bar form
Substitute for linear
potentiometer
T&R LP 38-SS 15 to 27 V/40 mA
Substitute for linear
potentiometer
Balluf f
BTL2-P1-xxxx-B-xx
BTL2-P1-xxxx-P/F-xx
22 to 26 V/80 mA
22 to 26 V/80 mA
Bar form
Substitute for linear
potentiometer
The resolution is 0.05 mm for a sensor length of less than 3 m. The resolu-
tion is 0.1 mm for the maximum sensor length of 6 m.
Up to 4 encoding sensors can be connected to one SM 338. Up to 4 measur-
ing points per encoding sensor are permitted. One SM 338 can evaluate a
total of up to 8 me asuring points.
When several measuring points are located on a sensor, the sensor-related,
minimum distance must be m ainta ined. This distance ensures that the mea-
suring points do not interfere with each other.
System scope
Sensor capabilities
Recommended
sensors
Sensor length and
measuring accu-
racy
Number of sensors
Minimum distance
of the measuring
points
The SM
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