National Instruments FP-3000 - Manual (Page 75)

Chapter 4 Block Reference
© National Instruments Corporation 4-23 FieldPoint FP-3000 User Manual
ACTUAL Mode
An indicator of the current mode of execution of the device. This is a
read-only parameter. Normally, the actual mode of the block is equal to the
target mode of the block. However, configuration errors or other conditions
can cause it to differ from the target mode.
PERMITTED Mode
A list describing the modes into which the block may be target. For
example, in order to set a
TARGET mode of Man , the Man mode bit must be
set in the PERMITTED mode field. The PERMITTED mode field also has an
effect on the way output blocks shed modes. For a description of mode
shedding, refer to Appendix D,
Advanced Function Block Behavior .
NORMAL Mode
The block’s normal mode of operation is stored in the NORMAL field. This
field is not used internally by the device, but is a guide for an operator.
Table 4-9. Modes
Mode Meaning Bit Set in TARGET Mode
Out of Service
OOS (0x80)
The block is idle and does not execute. If the
resource block is out of service, all other
blocks in the device are also out of service. Out of Service, and optionally
any other valid target mode
Manual
Man (0x10)
The output of the block is set by an operator
through a write to the output parameter. No
block processing other than writing to the
I/O channel is performed. Manual
Initialization
Manual
IMan (0x40)
The upstream block in a cascade loop is
preparing to enter
Auto mode. This mode
cannot be set as a target mode. It is used
internally by control blocks as they establish
cascade loops.
Not applicable
Local Override
LO (0x20)
The block’s faultstate or interlock capability
is causing the block to override its normal
output value. This mode cannot be set as a
target mode. Not applicable
Automatic
Auto (0x08)
The block operates normally with a setpoint
specified manually through a write to the
setpoint parameter. Automatic