IL PB BK DI8 DO4/EF-PAC
A-6
PHOENIX CONTACT
7725_en_01
Following a configuration block:
Following a failsafe block:
If one or more function blocks are present, a header byte for the function block follows:
After that the function blocks are decoded:
Table A-10
Parameters for the I/O devices byte 1
Byte
Bit
Meaning
Byte 1
Bit 7 to bit 6
00: Start block ID for device
Bit 5 to bit 4
Configuration
00: No configuration (e.g., DO)
01: Permanent configuration
10: Temporary configuration
Bit 3 to bit 2
Failsafe value
00: No failsafe value (e.g., DI)
01: Output zero
10: Maintain value
11: Apply value from data field
Bit 1
Extended functions
0: No function block
1: Function block (also several)
Bit 0
Activation
0: Activated
1: Disabled
Byte x
Bit 7 to bit 6
01: Configuration block ID
Bit 5 to bit 0
Length of the data block
Byte x+1 to n
n data bytes
Byte x
Bit 7 to bit 6
10: Failsafe value block ID
Bit 5 to bit 0
Length of the data block
Byte x+1 to n
n data bytes
Byte x
Bit 7 to bit 6
11: Function block ID
Bit 5 to bit 0
Entire function block length
An additional byte is automatically used if the total length
of the function block is exceeded. This byte specified the
actual length of the function block.
The first byte (header byte for the function blocks) is set
to FF
hex
.