Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 82)

Appendix
B
B-1
Processor Status File
Processor status data is stored in data-file 2.
This word of
the status file:
Stores:
S:0 Arithmetic flags
• bit 0 = carry
• bit 1 = overflow • bit 1 = overflow
• bit 2 = zero
• bit 3 = sign
S:1 Processor status and flags
Bit
Description
0 RAM checksum is invalid at powerĆup
1 processor in Run mode
2 processor in Test mode
3 processor in Program mode
4 processor burning EEPROM
5 enabled download operation
6 enabled test edit mode
7 mode select switch in Remote position
8 forces enabled
9 forces present
10 processor successfully burned EEPROM
11 performing online programming
12 processor in Debug mode
13 user program checksum done
14 last scan of ladder or SFC step
15 processor started fist program scan or the first scan of the next step
in an SFC
S:2 Switch setting information
• bits 0-7 DH+ station number
• bit 11Ć12 are set based on the I/O chassis backplane switches
bit 12
bit 11 = I/O chassis addressing
0 0 illegal
1 0 1/2Ćslot
0 1 1Ćslot
1 1 2Ćslot
• bit 13: 1 = load from EEPROM
• bit 14: 1 = RAM backup not configured
• bit 15: 1 = memory unprotected
S:0ĆS:2