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PROFIBUS / PROFIsafe - Commissioning
6.6.2.2.4 Safe-Control
Unsigned8
Byte X+8
Bit 7 – 0
Data 2 7 – 2 0
Bit
Description
iPar_EN: iParameter assignment unlocked
2 0 The bit must be set indirectly via a variable of the F-Host in order to be
able to execute the preset adjustment function, see chapter "Preset
Adjustment Function" on page 189.
OA_Req: Operator acknowledgement required
The bit is set by the F-Host driver after detection and elimination of an
error in the safety-oriented communication. The bit is also set if the
measuring system/F-Host could not be synchronously integrated into the
bus operation at start-up of the F-System.
2 1 An operator acknowledgement is displayed via the green LED (3x with
5 Hz) in relation to the measuring system. In this case a reintegration of
the function blocks contained in the safety program must be performed.
In this way the counters contained in the F-Host and F-Device for the
virtual consecutive numbers are synchronized. The measuring system is
then reset from safe status, output of passivated data, to normal status,
output of cyclical data.
R_cons_nr: Resetting of the counter for the virtual consecutive no.
2 2 The bit is set when the F-Host detects an F-Communication error, either
via the status byte or itself.
2 3 reserved
activate_FV: Activate fail-safe values
The bit is set inside the device via the firmware if the measuring system
2 4 can no longer output fail-safe data due to a device error, errors in the
safety-oriented communication or at start-up of the F-System. The
measuring system outputs its passivated data instead.
Toggle_h: Toggle bit
The toggle bit is host-based and causes the incrementation of the virtual
2 5 consecutive numbers in the F-Device. The toggle bit is used to
synchronize the counters in the measuring system/F-Host for generation
of the virtual consecutive number.
2 6 -2 7 reserved
The Safe-Control register can only be indirectly accessed from a F-Runtime Group
via the safety program with the aid of variables of the F-Periphery-DB, see chapter
"Access to the safety-oriented data channel" on page 183.
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05/25/2011 TR - ECE - BA - DGB - 0079 - 03 Page 151 of 207