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Chapter 4

Block Reference

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 National Instruments Corporation

4-11

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.

Remote Cascade

Remote Cascade

 and 

Automatic

. For 

more information on Remote Cascade 
operation, refer to the section 

 in Appendix D, 

.

Remote Output

Remote Output

 and 

Automatic

. For more 

information on Remote Output operation, 
refer to the section 

 in Appendix D, 

.

Table 4-6.  Actual Modes

Out of Service

O/S

 (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.

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.

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.

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.

Table 4-5.  Target Modes (Continued)