Instructions That Operate On Arrays; Gsv/Ssv Instructions - Allen-Bradley ControlLogix 5570 Reference Manual

Language Affected
Ladder Logic (RLL) Yes
Structured Text (ST) No
Function Blocks (FBD) No
Sequential Function Chart (SFC) No

GSV/SSV Instructions

Instructions That Operate On Arrays

Instruction actions are limited to member array boundaries. If any of these
instructions attempt to access past the end of a member array, they set the ER
bit and abort the operation.
AVE, BSL, BSR, DDT, FBC, FFL, FFU, LFL, LFU, SQL, SRT, and STD now
respect boundaries when reading.
5580/5380 Controllers
These instructions are now limited to member array
boundaries.
Mitigation
N/A
GSV and SSV instructions that access unused attributes in 5580 and 5380
controller projects display this verification warning.
IMPORTANT Rung <n>, GSV, Operand 2: Attribute is not used for this controller type.
Instruction has no effect.
Figure 20 - GSV/SSV of Controller Attributes
The warning occurs for the following controller attributes:
• DataTablePadPercentage
• TimeSlice (GSV/SSV)
• ShareUnusedTimeSlice (GSV / SSV)
Rockwell Automation Publication 1756-RM100F-EN-P - October 2018
Instruction Execution
5570/5370 Controllers
In previous controllers, these instructions could
overwrite member boundaries if the array was within a
UDT.
(GSV only)
.
Chapter 6
139