Technology modules
D300529 0115 - BL67 I/O modules12-32
When necessary, 1 byte represents the register address of the read data and an acknowledgment
th
at the read operation was successful.
1 byte can be used to transfer status messages of the
SSI encoder. This byte also contains an
acknowledgment that the write operation to the register was successful and indication of an active
write operation.
1 byte contains the results of comparison operations with the SSI encoder value.
1 byte contains messages co
ncerning the communication status between the BL67-1SSI module
and the SSI encoder, as well as other results of comparison operations.
The following table describes the structure of the 8 x 8 bits of the process input data. STS (or ERR) con-
tains non-retentive status informatio
n, i.e. the bit concerned indicates the actual status.
FLAG describes a retentive flag
that is set in the event of a particular event. The bit concerned retains
the value until it is reset.
Byte Byte
DP/PN
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
n = offset of input data; depending on extension of station and the corresponding fieldbus.
Meaning of the data bits (process input)
Diagnostic message
n
n + 7
STS_
STOP
--
ERR_
PARA
STS_
UFLW
STS_
OFLW
ERR_
SSI
SSI_DI
AG
Status messages SSI
n + 1
n + 6
STS_UP STS_DN
REL_
CMP2
FLAG
CMP2
STS_
CMP2
REL_
CMP1
FLAG
CMP1
STS_
CMP1
n + 2 n + 5
REG_WR_
ACEPT
REG_WR_
AKN
- - SSI_STS3 SSI_STS2 SSI_STS1 SSI_STS0
n + 3 n + 4
REG_RD_
ABORT
- REG_RD_ADR
Data bytes
n + 4
n + 3
REG_RD_DATA, data byte 0
n + 5 n + 2
REG_RD_DATA, data byte 1
n + 6 n + 1
REG_RD_DATA, data byte 2
n + 7 n
REG_RD_DATA, data byte 3
Table 12-1:
Meaning of the
d
ata bits (process
input)
Designation Value Description
STS_STOP 0 The SSI encoder is
read cyclically.
1 Communication with the SSI encoder is stopped as STOP =
1 (process output) or
ERR_PARA = 1.
ERR_PARA 0 The parameter set of the module has been accepted.
1 Operation of the module is not possible with the present
parameter set.
To Next Page
Loading...
