11.03 3 Safety-Related Functions
3.2 External STOPs
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-77
3.2 External STOPs
With this function it is possible to bring the drive to a standstill via the SGEs.
Sensors (e.g. protection mats, light barriers, …) can be connected to the SGEs.
Stopping the drives is then initiated depending on these connected sensors.
The drives can be brought to a standstill in the following ways:
• By canceling pulses SGE "de-select ext. STOP A"
• Braking with n
set
= 0 SGE "de-select ext. STOP C"
• Braking along the path SGE "de-select ext. STOP D"
• Initiate ESR SGE "de-select ext. STOP E"
(from SW 6.4.15)
Note
External STOPS only function in combination with "safe programmable logic"
(SPL) because an external STOP A remains selected, for safety reasons,
until SPL crosswise data comparison of the PLC and NCK is started.
The function "external STOPs" is enabled and activated via the following
machine data:
• Enabling the function
MD 36901/1301: $MA_/$MD_SAFE_FUNCTION_ENABLE
(enables safety-relevant functions)
Bit 0: Enable SBH/SG (see note)
Bit 6: Enable external STOPs
Bit 4: Enable external STOP E
Note
• In addition to enabling of the function "external STOPs", function
SBH/SG must also be enabled as a minimum requirement.
• The external STOP E must be enabled with bit 4 = 1 in addition to bit 6
"enable external STOPs".
Assigning to an input terminal and/or system variable
In order to trigger a stop via the NCK monitoring channel an input terminal or a
system variable must be assigned to the stop request.
This assignment is configured using the following machine data:
MD 36977: $MA_SAFE_EXT_STOP_INPUT[n]:
(input assignment, external stop request) with n = 0, 1, 2, 3.
Description
Enabling and
activating the function
Assigning to the input
terminals
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