Bradley Smoker user manual Monitoring Status Bits, PLC-5/60, -5/60L, -5/80, 5/80E

Preparing Fault Routines 15-13

For a description of the minor faults in word 1 (S:10) and word 2 (S:17), see

Appendix B.

Monitoring Status Bits

Two types of status bits display information about your system: global status bits and multiple chassis status bits.

Each bit represents an entire rack, no matter how many chassis make up a rack. (Remember that you can have a maximum of four chassis configured as quarter racks to make up one I/O rack.) These bits are stored in the lower eight bits of words S:7, S:32, and S:34.

The global status bits are set if a fault occurs in any one of the racks. See the table below to determine the number of bits.

Controller	Possible I/O Rack Bits
PLC-5/11, -5/20, 5/20E	4
PLC-5/30	8
PLC-5/40, -5/40L, 5/40E	16
PLC-5/60, -5/60L, -5/80, 5/80E	24

The multiple chassis status bits are used to monitor the racks in your I/O system. This information is stored in the I/O status file (S:16, low byte) that you specify using the controller configuration screen in your programming software. The software automatically creates an integer data file to store two words of status bits for every rack configured in your system.

For more information on global status bits and multiple chassis status bits, see the documentation for your programming software.

Publication 1785-UM012D-EN-P - July 2005