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B-7GFK–0804B Appendix B Micro PLC Protocol
Start Program
ID 08
Reply:
ID 08 stat_high stat_low
stat_high – High byte of status word
stat_low – Low byte of status word
Status Word:
bits 0 – 7 are for fatal conditions (stopping the PLC)
bits 8 – 11 are for non-fatal conditions
bit 15 is informational
0 memory is corrupted
1 invalid program
2 invalid instruction encountered
3 (runtime error (such as Indirect Move to invalid address)
4 – 6 reserved
7 forced stop (PLC stopped by error or by programmer)
8 I/O problem
9 system timer malfunction
10 – 14 reserved
15 Program mode (1 if in Program mode)
Stop Program
ID 09
Reply:
ID 09 stat_high stat_low
stat_high – High byte of status word
stat_low – Low byte of status word
Error Reply
ID 8x error_code
8x is the command code to which this is the reply plus 128 (80h).
error codes:
1 Receive buffer overflow
2 Checksum error
3 Illegal command code
4 Illegal command format
5 Block size too big or zero
6 Cannot modify program while running
7 Cannot run while switch is in PROG position
8 Address out of range