User manual

Hardware Components
Processor Status File 1-14
Processor Status File
This word of the status file: Stores:
S:0 Arithmetic flags
• bit 0 = carry
• bit 1 = overflow
• bit 2 = zero
• bit 3 = sign
S:1 Processor status and flags
Bit
Description
0 RAM checksum is invalid at power-up
1 processor in RUN mode
2 processor in TEST mode
3 processor in PROG mode
4 processor burning EEPROM
5 processor in download mode
6 processor has test edits enabled
7 mode select switch in REMOTE position
8 forces enabled
9 forces present
10 processor successfully burned EEPROM
11 performing online programming
12 not defined
13 user program checksum calculated
14 last scan of ladder or SFC step
15 processor running first program scan or the first scan of the next step
in an SFC