ProSoft Technology MVI56-AFC - Manual (Page 171)

MVI56-AFC ♦ ControlLogix Platform MVI56-AFC Backplane Communication
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 171 of 316
February 25, 2011
11.2.2 Function Block Definition - 0: Null
Output Function Block ID
Function Block Name: Null
Function Block ID: 0 decimal, 000000 binary, 0 dec.
Target: Global
Data Block Length: User Defined
Total Block Length: (User Defined + 1) Elements
Description
This function block is used as a space filler only. It implies no action by the AFC.
Null: Output Function Block (OFB) Null: Input Function Block (IFB)
Element Attribute Element Attribute
0 Block ID - Function Code & Length 0 Block ID - Function Code
1 Null Data 1
2 2
… …
… …
n n
Note: A Block ID with all 16 bits set to 0 is interpreted as a Null FB of length 1 (the Block ID itself).
Note also that because the Null FB implies no action, the settings of the "out" and "inp" bits are
irrelevant.
Note: Refer to Function Block Structure (page 168) for information on Bit 8 and 9 settings.