ATTENTION
When the SVP IOM is in 'IDLE' or the channel is in 'INACTIVE',
l The SVP_AO channel configured as Incremental drives the output configured in the
FAULTOPT parameter.
l The SVP_AO channel is configured as FullValue, the SVP_AO channel retains the
output.
If any changes made to the FAULTOPT parameter when the SVP IOM is in 'IDLE' or the
channel is in 'INACTIVE,' the change replicates on the SVP_AO channel screws.
10.26.2 Determining Direct/Reverse Output - SVP-AO Channel block
The OPTDIR (output direction) parameter allows you to specify whether the output of the data
point is 'Direct or Reverse' when OPACTION is configured as 'FullValue.' When OPACTION is
configured as 'Incremental,' the OPTDIR is grayed out and its value is 'Direct.' The following table
lists the OP value mapping based on the OPTDIR value.
- 441 -
Chapter 10 - Series C I/O Configuration
Chapter 10 - Series C I/O Configuration
OPTDIR value OP value mapping
Direct OP 0% maps to OPLOCURRENT
OP 100% maps to OPHICURRENT
Reverse OP 0% maps to OPHICURRENT
OP 100% maps to OPLOCURRENT
Table 10.28 SVP - AO OPTDIR processing
10.26.3 Determining Modes - SVP-AO Channel block
The MODE parameter determines the operating mode for the channel block. The following
operating modes are applicable to the both AO and DO channel blocks:
l Manual (Man) - provides the operator or the program with direct control over the output value
of the channel, regardless of any continuous control strategy.
l Cascade (CAS) - data point receives its output value from a primary data point.
However, if the OPACTION is configured as 'Incremental' and MODE is changed to 'MAN,' the AO
drives OPBIASCURRENT, until the operator manually enters a new OP value.
ATTENTION
l MODE is set to 'SHED' if the SVPM is restarted.
l The SVP IOM shortly loses synchronization and resynchronizes when the MODE of
SVP_AO channel sheds to 'MAN.' This scenario is applicable to only when the SVP_AO
channel is configured as 'Incremental.' Due to this, the soft failures are regenerated
on the secondary SVP IOM.
