Allen-Bradley PLC-5 User Manual page 275

S:0 - S:2
1
Processor Status File
Processor status data is stored in data file 2.
For more information about any of these topics, see the
IMPORTANT
description in this manual or the documentation for your
programming software.
This Word Stores
S:0 Arithmetic flags
• bit 0 = carry
• bit 1 = overflow
• bit 2 = zero
• bit 3 = sign
S:1Processor status and flags
S:1/00 RAM checksum is invalid at power-up
S:1/01 Controller in run mode
S:1/02 Controller in test mode
S:1/03 Controller in program mode
S:1/04 Controller uploading to memory module
S:1/05 Controller in download mode
S:1/06 Controller has test edits enabled
S:1/07 Mode select switch in REMOTE position
S:1/08 Forces enabled
S:1/09 Forces present
S:1/10 Controller controllerr successfully uploaded to memory module
S:1/11 Performing online programming
S:1/12 Not defined
S:1/13 User program checksum calculated
S:1/14 Last scan of ladder or SFC step
S:1/15 Controller running first program scan or the first scan of the next
step in an SFC
Appendix
Publication 1785-UM012D-EN-P - July 2005
B