Profisafe Description; Profisafe Message Format - ABB FSO-21 User Manual

PROFIsafe description

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PROFIsafe message format

The FSO 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.
Data F-Input / F-Output user data
Size (octets)
Control Byte and CRC2 bit order
PROFIsafe messages sent from the safety PLC to the FSO 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 is the length of F-Output user data.
o
Octet Bit Name
Control Byte
N 7 Reserved
o
6 Reserved
5 Toggle_h
4 Activate_FV
3 Use_TO2
2 R_cons_nr
1 OA_Req
0 iPar_EN
CRC2
N +1 7 CRC bit 23
o
...
0 CRC bit 16
N +2 7 CRC bit 15
o
...
0 CRC bit 8
N +3 7 CRC bit 7
o
...
0 CRC Bit 0
Max. 12
Description
The value is ignored.
The value is ignored.
Toggle bit
Fail-safe values (FV) to be activated
Use F_WD_Time_2 (secondary watchdog).
Not in use. The value is ignored.
Reset Vconsnr_d
Operator acknowledgement requested
Parameter assignment deblocked.
Not in use. The value is ignored.
Octet 3 (MSB) of 24 bit CRC
Octet 2 of 24 bit CRC
Octet 1 (LSB) of 24 bit CRC
Status / Control Byte CRC2
1
PROFIsafe 165
3