are transmitted from the FSPS-21 module to the safety PLC. For a detailed description of
the PROFIsafe message format, see section PROFIsafe message format (page 113).
F-Parameters are PROFIsafe parameters that all PROFIsafe devices support. F-Parameters
are sent from the F-Host (safety PLC) to the F-Device (FSPS-21 module) when the
PROFIsafe connection is created. They contain the PROFIsafe addresses and the watchdog
time for the PROFIsafe connection.
Note:
We recommend that you use only PROFINET compatible Ethernet switches and cables in
the PROFIsafe communication bus.
FSPS-21 module passivation
If the FSPS-21 module or the safety PLC detects an error in the fieldbus communication,
the FSPS-21 module is passivated. The module activates the STO function, goes into Safe
state and generates an FSx safety bus warning (0xA7DD).
PROFIsafe description
￭ PROFIsafe message format
The FSPS-21 module supports only the PROFIsafe short frame format. The short frame
supports a maximum of 12 octets of user data. The frame also includes a CRC (3 octets)
and one Status/Control Byte octet. Therefore, the maximum frame size of the message is
16 octets.
CRC2Status / Control ByteF-Input / F-Output user dataData
31Max. 12Size (octets)
Control Byte and CRC2 bit order
PROFIsafe messages sent from the safety PLC to the FSPS-21 module include the F-Output
user data, the Control Byte and CRC2.
This table shows the bit order of the Control Byte and CRC2. N
o
is the length of F-Output
user data.
DescriptionNameBitOctet
Control Byte
The value is ignored.Reserved7N
o
The value is ignored.Reserved6
Toggle bitToggle_h5
Fail-safe values (FV) to be activatedActivate_FV4
Use F_WD_Time_2 (secondary watchdog). Not in use. The value
is ignored.
Use_TO23
Reset Vconsnr_dR_cons_nr2
Operator acknowledgement requestedOA_Req1
Parameter assignment deblocked. Not in use. The value is ignored.iPar_EN0
PROFIsafe 113
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