GFK-0825F Chapter 8 Datagrams 8-33
8
Read Slot Diagnostics
Subfunction Code: 42 hex
This datagram can be used to read diagnostics information for a specific slot, point, or channel
from a BIU. This message does not provide channel or point information for intelligent modules
(which includes certain types of I/O modules and Micro Field Processors). Intelligent modules can
be configured to provide the information automatically.
Byte # Description
0 Slot number: 1 - 8
Read Slot Diagnostics Reply
Subfunction Code: 43 hex
This datagram provides the information requested by a Read Slot Diagnostics datagram.
Byte # Description
0 Slot number: 1 - 8
1 Board Status for slot
2 Board identification fault bit (msb)
3 - 18 Slot diagnostics data (no meaning for discrete boards)

Board Status (Byte 1)

76543210
Configured
Mismatched Board ID
Missing
Mismatched I/O
Extra I/O Module
Status: No User Power (for some analog modules)
Smart Module Available
Unsupported module type
For conventional I/O modules, 01 in this byte indicates no faults. For intelligent modules, 41 hex
indicates no faul ts.

Board ID (Byte 2)

If the designated slot has a discrete output module, the most significant bit of byte 2 indicates
whether the module has a blown fuse or loss of user power fault.
If the designated slot ha s a con ventional analog input modu l e, the most significant bit of byt e 2
indicates a loss of user power fault.
This byte has no meaning for other types of modules.

Bytes 3 - 18 (Slot Diagnostics Data)

76543210
Input channel low alarm
Input channel high alarm
Channel underrange
Channel overrange
Channel open wire, for analog input modules in 4-20mA range
reserved
Loss of user power for analog output modules only