User guide

Software
58
890 USE 108 00 August 2001
(Two-Nodes)
(One-Node)
LAB Labels the entry point of a ladder logic subroutine
RET Returns from the subroutine to scheduled logic
PID Instruction
(Three-Nodes)
PID2 Performs a specified proportional-integral-derivative function
Enhanced Math
(Three-Nodes)
EMTH Performs 38 math operations, including floating point math operations and extra integer
math operations such as square root
Ladder Logic
Interrupt
Instructions
(Two-Nodes)
ITMR Defines an interval timer that generates interrupts into the ladder logic scan. E984-258/
265/275/285 only
(One-Node) ID Protects data in both the normal (scheduled) ladder logic and the (unscheduled)
interrupt handling subroutine logic. E984-258/265/275/285 only
(One-Node) IMIO Permits access of specified I/O modules from within ladder logic that differs from the
normal I/O processing procedure. E984-258/265/275/285 only
(One-Node) IE Protects data in both the normal (scheduled) ladder logic and the (unscheduled)
interrupt handling subroutine logic. E984-258/265/275/285 only
(Three-Nodes) BMDI Protects data in both the normal (scheduled) ladder logic and the (unscheduled)
interrupt handling subroutine logic. E984-258/265/275/285 only
Modbus Plus
Networking
Instruction
(Three-Nodes)
MSTR Specifies a function from a menu of networking operations (This function is available
only on the A984-145, E984-245/255, and E984-265/275/285 Controllers that support
Modbus Plus communications. No CKSM supported for E984-245/255)
Application
Specific (Three-
Nodes)
SAVE Saves a block of 4x registers to state RAM where they are protected from unauthorized
modification. E984-258/265/275/285 only
LOAD Loads a block of 4x registers (previously SAVEd) from state RAM where they are
protected from unauthorized modification. E984-258/265/275/285 only
Instruction Description