Process data and status information
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5 Process data and status information
5.1 Cyclic process data
Data from IO-Link master to CBMC IO-Link (PDout)
The channels can be switched on and off and the nominal currents changed through the cy-
clic process output data (PDout) of the master to CBMC E4 ... IOL. The data is transmitted
in three bytes (see Table 5-1). Settings by means of PDout are not saved in the read only
memory of the CBMC E4 ... IOL, in contrast to acyclic data or button entries. This means it
is possible to frequently switch the outputs cyclically without influencing the service life of
the internal read only memory.
Example:
PDout = 8F AA AA
hex
(PDout valid, switch all channels on, and all four nominal currents to
10 A)
Validity PDout
(Valid Flag)
In order for the device to perceive the PDout of the master as valid, it is necessary that the
MSB is set from Byte [0] to 1. In the case of a 0 in the MSB, the received PDout is ignored.
Switch channel For switching on, a 1 must be written into the bit of the respective channel. Correspondingly,
a 0 must be written at the desired bit position for switching off. When several channels are
switched on concurrently, these are switched on sequentially with 100 ms difference.
Table 5-1 Bit-assignment of the PDout data type
Byte 0 PDout Valid
Flag
Reserved Switch
channel 4
Switch
channel 3
Switch
channel 2
Switch
channel 1
Bit 23 22 21 20 19 18 17 16
Byte 1 PDout Nominal current channel 1 Nominal current channel 2
Bit 15 14 13 12 11 10 9 8
Byte 2 PDout Nominal current channel 3 Nominal current channel 4
Bit 7 6 5 4 3 2 1 0
The CBMC E4 ... IOL can also be operated in the case of cyclic communication on the
user interface using buttons, insofar as this function is not blocked by device access locks
(see Section "Device access locks" on page 29. Button entries effect the change into "in-
dependent operation" in which the device receives, but ignores, the cyclic data coming
from the master, until this changes again in at least one bit.
A change of the nominal current via PDout also effects a change back to IO-Link opera-
tion, so that channels can be switched on and off in this way.
If an error in the power path is detected on a channel (see Section "Diagnostics and status
indicators" on page 12), it is not possible to switch on the channel, either by button or via
IO-Link.
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