Publication 1747-RM001G-EN-P - November 2008
SLC 5/03 (OS30x), SLC 5/04 (OS40x) and SLC 5/05 (OS50x) Firmware History A-21
OS302, Series C, FRN 11
OS401, Series C, FRN 11
OS501, Series C, FRN 11
released: June 2008
Enhancements
• Modbus RTU Master capability on RS232 Channel 0
Modbus RTU Master capability is added to RS232 Channel 0
communication.
Modbus Message commands supported:
– 01 Read Coil Status
– 02 Read Input Status
– 03 Read Holding Registers
– 04 Read Input Registers
– 05 Force (Write) Single Coil (Latch/Unlatch)
– 06 Preset (Write) Single Register
– 15 Force (Write) Multiple Coils
– 16 Preset (Write) Multiple Registers
– "Force" and "Preset" are presented as "Write"
• PID Rational Approximation enhancement
Added rational approximation method for better calculation accuracy.
This bit is disabled by default so as to maintain existing program
behavior when upgrading from previous FRN. For the new design,
enable Rational Approximation method by setting Word 0, bit 14 to ’1’
in the PID control block.
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