Burkert Type 8691 - Manual (Page 51)

51
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11.11 configuration of the safety position of pilot valves
for bus error
If a bus fault occurs, the bus status LED may assume the "Green flashing", "Red flashing" or "Red" status.
(For a description see “Status of the bus LED”, page 55)
The valve safety position and safety module attributes can be used to configure the pilot valve in the event of a bus fault.
If a bus fault occurs, the configuration data of the pilot valves can be accessed acyclically via Explicit Messages.
• The Get_Attribute_Single service stands for a read access of the configuration data.
• The Set_Attribute_Single service stands for a write access of the configuration data.
1 data byte for safety mode:
(Attribute address: class 150, instance 1, attri-
butes 7) 1 data byte for valve safety position:
(Attribute address: class 150, instance 1, attributes 6)
Bit mode Value assignment Bit pilot valve Value assignment
Bit 0
Character-
istics in event
of bus fault 0 Output safety position
1 Retain last valve
position
Bit 0
Y1
(pilot valve 1) 0 pilot valve 1 OFF
1 pilot valve 1 ON
Bit 1... not used 0 always
Bit
1–7
not used 0 always Bit 7
Table 19: Data byte for safety mode Table 20: Data byte for valve safety position
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Type 8691