Rockwell Automation 2727-G7P20D3Q7 MobileView G750 Guard Machine Terminal - Manual (Page 26)

Publication 2727-UM002D-EN-P
2-8 Safety Precautions and Elements
Foreseeable Misuse of the Enabling Switch
Foreseeable misuse means not allowing the enabling switch to be
fixed in the enabling position. 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 turning on the
machine/plant and inquiry of the enabling switch when
changing 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 period of
time and pushed into the enabling position again. The length of
time must be defined according to the activity.
Emergency Stop Switch The emergency stop switch of the MobileView terminal meets the
requirements of EN 418. It must be designed as an emergency stop of
category 0 or category 1 (see EN 60204-1, chapter 9.2.5.4.2) on the
basis of the risk assessment for the machine. The connection of the
force-guided contacts to an appropriate monitoring system must meet
the safety category which is defined by means of the risk assessment
(in accordance with EN 954-1) of the machine.
The emergency stop has 2, potential-free, normally closed contacts for
connecting external peripherals, a nominal operating voltage of 24V
(Safety Extra Low Voltage in accordance with EN 61131-2 and EN
50178), and a maximum operating current of 500 mA.
ATTENTION
!
• When the emergency stop switch is not wired
into the emergency stop circuit, the MobileView
terminal must be stored where it is not available
to operators.
Consider that the operator might activate the
nearest emergency stop in case of danger. This
could have fatal consequences if the emergency
stop does not function.
• Emergency stop functions must remain
operational in all operating modes. Resetting an
activated emergency stop must not result in
uncontrolled startup of machines or installations.
• The emergency stop switch does not replace
other safety devices.