Instruction Manual PSE2xxDN
17
d) I/O connections
The PSE2xxDN supports the following types of I/O messages:
Poll (class ID 5, instance 2)
Bit strobe (class ID 5, instance 3)
Change-of-state/cyclic (class ID 5, instance 4), with or without master
acknowledge
Setting up an I/O connection first requires the use of an explicit connection to allocate
the desired I/O connection; the corresponding identifiers are then reserved and the
connection is set to "configuring" status. The next step is to set the expected packet
rate, after which point the I/O connection will be in place.
The expected packet rate is always attribute 9 (for a given instance in class 5).
WARNING:
Activating the change-of-state/cyclic connection may cause the CAN bus
to be flooded with messages as soon as the EPR has been set; to prevent this from
occurring, the inhibit time (class ID 5, instance 4, attribute 17), which indicates the
minimum amount of time that must elapse before a change-of-state event actually
triggers an I/O message, should be set prior to establishing this type of connection.
Only then should the EPR be set.
e) Mapping I/O assemblies
The following 4 assemblies are permanently stored in the PSE2xxDN:
Assembly object (class ID 4),
instance 100
, attribute 3:
Bit
Byte
Meaning
Source
0-31
0-3
actual value
PSE object (class ID 100), instance 1, attr. 3
32-47
4-5
status word
PSE object (class ID 100), instance 1, attr. 37
48-63
6-7
actual rpm
PSE object (class ID 100), instance 1, attr. 48
Assembly object (class ID 4),
instance 101
, attribute 3:
Bit
Byte
Meaning
Source
0-16
0-1
status word
PSE object (class ID 100), instance 1, attr. 37
Assembly object (class ID 4),
instance 103
, attribute 3:
Bit
Byte
Meaning
Source
0-31
0-3
target value
PSE object (class ID 100), instance 1, attr. 1
32-47
4-5
control word
PSE object (class ID 100), instance 1, attr. 36
Assembly object (class ID 4),
instance 104
, attribute 3:
Bit
Byte
Meaning
Source
0-7
0
control word,
bit 4 (release)
PSE object (class ID 100), instance 1, attr. 36
These assemblies cannot be changed and no additional assemblies may be added.
