Publication 1766-RM001A-EN-P - October 2008
Application Specific Instructions 239
RPC - Read Program
Checksum
Instruction Type: Output
The RPC instruction reads Program copies the checksum of the processor
program from either the processor's RAM memory or from the installed
memory module into the designated destination integer file location
Enter the following parameters when programming this instruction:
• Proc/Mmod is an immediate value with a range from 0…1. Specify
where the Program checksum is read, and what type of operation to
be performed (Proc-Mem / Mem Mod).
• Destination is the address to store the result of Program Checksum
from processor memory.
Read Program Checksum
Proc/Mmod PROC-MEM
Dest N7:0
0000h<
RPC
Execution Time for the RPC Instruction
Controller When Instructions Is:
True False
MicroLogix 1400 4.2844 µs 0.2028 µs
RPC Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
Parameter
Data Files
Function Files
(1)
CS - Comms
IOS - I/O
DLS - Data Log
(2)
Address Mode
(3)
Address Level
O
I
S
B
T, C, R
N
F
ST
L
MG, PD
RI/RIX
PLS
RTC
HSC
PTOX, PWMX
STI
EII
BHI
MMI
LCD
Direct
Indirect
Immediate
Int16
Immediate Int32
Immediate Float
Bit
Word
Double Word
Element
Float
Source A • •
Destination • •
(1) PTOX and PWMX files are only for use with MicroLogix 1400 BXB or BXBA unit.
(2) The Data Log Status file can only be used for the following math instructions: ADD, SUB, MUL, DIV, NEG, and SCP.
(3) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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