Installation manual

Publication 1747-RM001G-EN-P - November 2008
A-2 SLC 5/03 (OS30x), SLC 5/04 (OS40x) and SLC 5/05 (OS50x) Firmware History
OS301, Series A, FRN 5
released: August 1994
Enhancements
• ASCII Instructions
The ASCII instructions ABL, ACB, ACI, ACL, ACN, AEX, AHL, AIC,
ARD, ARL, ASC, ASR, AWA, and AWT are supported in this release.
The STRING and ASCII data types are also supported.
• Floating Point Instructions
The instructions EQU, NEQ, LES, LEQ, GRT, GEQ, ADD, SUB,
MUL, DIV, NEG, CLR, SQR, MOV, FLL, COP, LIM support floating
point data in this release.
• 10usec User Interrupt Timer
The lower 16 bits of the processor’s 20-bit 10usec internal free running
clock is copied to either S:43 (STI), S:44(IOI), or S:45(DII) prior to
executing the user interrupt ladder file. This allows a user to determine
the amount of time that has elapsed between consecutive interrupt
subroutines.
• PLC-5 Read/Write Capability
PLC-5 typed read and write commands can now be initiated and
received.
• Average Scan Time Calculation
The average scan time calculation has been changed to more accurately
calculate the average scan time.
• DTR Control
The controlling of the DTR signal has been changed so that it is turned
back ON only if the forcing control bit is enabled when the processor
goes from a RUN to non-RUN mode.
• Dual Message Buffering
The dual message buffering capabilities has been increased from 4
buffers for both channels to 4 buffers per channel.
• Remote Messaging
Remote messaging is now allowed beyond the maximum node address.