Yokogawa YVP110 - Manual (Page 81)

<15. OS Function Block>
15-2
IM 21B04C01-01E
When this action is enabled, the value set in
HYSTVAL serves as hysteresis, which affects the
output as follows:
When SP has increased beyond X12, OUT_1 is
set to Y11.
Then, after SP has decreased below X12 minus
HYSTVAL, OUT_1 returns to follow the set
characteristic.
F1504.ai
(X11, Y11)
OUT_1 (X12, Y12)
SP
HYSTVAL
LOCKVAL=No Lock
LOCKVAL=Lock
Figure 15.4 LOCKVAL and HYSTVAL
When both downstream blocks of the OS block
are ready for cascade connection, the OS block
connects the block on the side of OUT_1 first. For
bumpless mode change on the side of OUT_2,
the balancing time for connection can be set in
BAL_TIME. When either downstream block alone
is ready for cascade connection, the OS block
connects it and enters the Cas mode. When
neither downstream block is ready for cascade
connection, the mode of the OS block is set to
IMan.
15.4 Backward Path
(BKCAL_OUT)
The value of SP or a value calculated from the
value of either BKCAL_IN_1 or BKCAL_IN_2,
depending on the handshake status with the
downstream blocks, is output through BKCAL_
OUT. In normal operating conditions (i.e., BLK_
MODE.actual is Cas or Auto), BKCAL_OUT is set to
the value of SP.
15.5 STATUS_OPTS
STATUS_OPTS is a parameter that stipulates
options about the block’s signal processing and
mode transitions. Table 15.1 shows the options
available in STATUS_OPTS of the OS block.
Table 15.1 STATUS_OPTS of OS Block
Bit Meaning Description
1 IFS if BAD
CAS_IN
If this option is True, then: Set
the sub-status components
of OUT_1.status and OUT_
2.status to Initial Fault State
(IFS) if CAS_IN.status is Bad.
4 Propagate Fault
Backward
If this option is True, then: Set
the status of BKCAL_OUT to
device failure if the quality and
substatus components of both
BKCAL_IN_1 and BKCAL_IN_
2 are Bad-Sensor Failure and
Device Failure, respectively.
If this option is False, then: Set
the status of BKCAL_OUT to
device failure if the quality and
substatus components of either
or both BKCAL_IN_1 and
BKCAL_IN_2 are Bad-Sensor
Failure and Device Failure,
respectively.
15.6 Alarm Processing
When the condition shown in the table below is
met in the OS block, the OS block changes the
bit statuses of BLOCK_ERR accordingly and
generates a block alarm (BLOCK_ALM).
Table 15.2 BLOCK_ERR in OS Block
Bit Name of Error
Represented
Description
1 Block
Configuration
Error
The settings of IN_ARRAY
and OUT_ARRAY satisfy
one or more of the following
conditions:
X21 < X11
X12 ≤ X11
X22 ≤ X21
15 Out of Service The target mode (MODE_BLK.
target) is OS.