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Rockwell Automation Publication 2711T-QS002C-EN-P - March 2019
Second Generation MobileView Tethered Operator Terminal
Foreseeable Misuse of Enabling Switch
Foreseeable misuse is when the enabling switch is modified so it stays in the enabling position.
The foreseeable misuse of the enabling switch must be restricted. The following measures are
recommended, which cause the machine to stop in manual mode.
• Inquiry of the enabling switch when you turn on the machine/plant, and inquiry of the
enabling switch when you change the operating mode from automatic to manual (the
enabling switch must not be in the enabling position).
• The enabling switch must be released within a defined time period and pushed into the
enabling position again, with the time length defined by the activity.
Illuminated Emergency Stop (E-stop) Push Button
The illuminated E-stop push button of the second generation MobileView 2711T terminal meets
the requirements of ISO 13850. The push button must be designed as a Category 0 or Category 1
emergency stop by the risk assessment for the machine. The connection of the force-guided
contacts to an appropriate monitoring system must meet the safety level that results from the risk
assessment of the machine. See
Risk Assessment of Machinery on page 7
.
The E-stop has two potential-free, normally closed contacts to connect external peripherals, a
nominal operating voltage of 24V (safety low voltage in accordance with EN61131-2), and a
maximum operating current of 500 mA at 24V DC.
ATTENTION:
Illuminated E-stop push buttons that are not fully functional can have fatal
consequences.
Illuminated E-stop push buttons must be effective under all circumstances in all operating modes
of a machine or plant.
• When the illuminated E-stop push button is not wired into an emergency stop circuit, the
second generation MobileView 2711T terminal must be stored where it is not visible to
operators.
• The reset of an activated E-stop push button must not result in the uncontrolled startup of
machines or installations.
• The illuminated E-stop push button does not replace other safety devices or E-stop buttons
mounted directly on machines.
• Test the functionality of the illuminated E-stop push button at least once every six months.
Verify that machine or plant operation stops when the button is pushed.
• When a second generation MobileView 2711T terminal has been exposed to shock (for
example, it is dropped on the ground), test to verify that the E-stop push button still functions
properly.
