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Chapter 4

Block Reference

4-12

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 National Instruments Corporation

A list describing the modes into which the block may be target. For 
example, in order to set a 

Target

 mode of 

Manual

, the 

Manual

 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, 

.

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.

Automatic

Auto

 (0x08)

The block operates normally with a setpoint 
specified manually through a write to the 
setpoint parameter.

Cascade

Cas

 (0x04)

The block operates normally with a setpoint 
specified automatically through a connection 
from an upstream block to the 

CAS_IN

 

(cascade input) parameter. Before the block 
can enter this mode, the cascade is initialized 
automatically to avoid windup.

Remote Cascade

RCas

 (0x02)

The block operates normally with a setpoint 
specified automatically through a write from a 
host computer to the 

RCAS_IN

 (remote 

cascade input) parameter. Before the block 
can enter this mode, the cascade is initialized 
automatically to avoid windup.

Remote Output

ROut

 (0x01)

The output of the block is set manually 
through a write to the 

ROUT_IN

 parameter. No 

block processing other than writing to the I/O 
channel is performed. Before the block can 
enter this mode, the cascade is initialized 
automatically to avoid windup.

Table 4-6.  Actual Modes (Continued)