Allen-Bradley 1747-SN - M1 Status File Description; General Communication Status - Enable Device Fault Bit

4–21Scanner Configuration and Programming
Publication 17476.6 - July 1996
M1 file words 0 through 47 contain the status of all devices on the
scanner’s RIO link. M1 is a read only file; do not write to this file.
Words 0–47 of the M1 file provide the following information:
• Word 0 (M1:e.0) – general communication status (overall device
fault and communications attempted)
• Word 2 (M1:e.2) – RIO baud rate status
• Word 3 (M1:e.3) – complementary device starting address status
• Word 4 (M1:e.4) – complementary logical image size status
• Word 5 (M1:e.5) – complementary active device status
• Word 8 (M1:e.8) – primary/normal device starting address status
• Word 9 (M1:e.9) – primary/normal logical image size status
• Word 10 (M1:e.10) – active device status
• Words 12–15 (M1:e.12 –15) – device fault status
• Words 16–31 (M1:e.16–31) – primary/normal device retry
counters
• Words 32–47 (M1:e.32–47) – complementary device retry
counters
General Communication Status - Enable Device Fault Bit
Word 0, bit 0 – is the Enabled Device Fault status bit. When any
enabled device is faulted, this bit is set to 1. A fault may be caused
by a communication problem with a remote device.
0123456789101112131415
11xxxxxxxxxxxxxx
General Communication Status Word, Word 0 M1:e.0
M1 File
M1 (Status) File W ord 0
Enabled Device
Fault Bit
Bit Number (decimal)
M1 Status File Description