2TLC172188M0201, rev. H
10
www.abb.com/lowvoltage
2012-01-03
3.2
SM2 – Pushbutton unit
Application
The SM2 stop unit is used together with Smart Logger to give a stop signal without electrical connection to
machines or control systems. SM2 is connected to any of the I/O connectors on Smart Logger.
The pushbutton on the underside of SM2 initiates stop time or intermediate time measurement when it is pressed
or released, depending on the settings of the New measurement form in Smart Manager. When the in signal of
SM2 is set to be active high, the unit can be used to measure the stop times of emergency stops, program stops,
safety mats, contact strips and the like. The ‘stop device’ is pushed by the means of the pushbutton on the
underside of SM2. The stop timing will start when this pushbutton is pressed.
When the in signal of SM2 is set to be active low, the unit can be used for the measurement of stop times on two-
hand units, and hold to run/enabling devices. Hold in for example one button on the two-hand unit by means of the
pushbutton on the underside of SM2. The measurement starts when the pushbutton on SM2 is released, i.e. when
the pushbutton on the two-hand unit is released.
General
When using the SM2 stop unit it is important that the correct procedure is carried out in order to obtain the best
values possible without electrical connection to the machine. The quickest and most distinct movement possible
should always be made, both during the actuation of stop devices, emergency stop buttons, and ”on” buttons with
hold to run function, such as two-hand units. A quick movement minimizes the small time difference between the
response of the stop device button and the button in the stop unit starting the
measurement.
Indication
The LED on top of SM2 is for example used to give manual stop signal at the same
position for a machine each time. The LED is lit by the output signal from Smart
Logger to SM2, the conditions can be set in Smart Manager.
Measurement on two-hand device
The diagram to the right illustrates an appropriate movement during the measurement
of stop times initiated by two-hand units with mushroom buttons. The SM2 stop unit
should be drawn quickly and distinctly to the side, that is, at right angles to the
inherent movement of the two-hand button.
Technical specifications
Manufacturer:
ABB AB / JOKAB SAFETY
Designation:
SM2
Article number:
2TLA070300R0200
Operating voltage:
Supplied from Smart Logger
Size:
100 x 50 x 25 mm (L x W x H)
Weight:
0.2 kg
Colour:
Black/Yellow
