CTI 2572-B / 2500C-2572-B Installation and Operation Manual 90
Module Status Word
The Module Status Word (WX1) is used to communicate the overall status of the module. The module uses
the following bit structure:
Bit 1 - MOD STATUS - Module Status
This bit is set to 1 whenever the application
firmware OK and the network server is started.
Bit 2 –RSVD – Reserved
This bit is reserved for future use.
Bit 3 -NET CFG - Network Configuration Required
This bit is set by the module application code to
indicate that the network CAMP server has not
been started. The primary use of this bit is to
condition PLC ladder logic to trigger the S
TART
NETWORK SERVICES command.
When the PLC Start option is selected, this bit is
set to a value of 1 at startup. When the CAMP
network server has successfully started, this bit is
set to a value of 0.
Bit 4 and 5– RSVD - Reserved
These bit positions are reserved for future use.
Bit 6 – LS - Link Status
This bit indicates the status of the Ethernet Link. It
is set to a value of 1 when the Ethernet port is
connected to a functioning Ethernet switch or
device. Otherwise is set to a value of 0.
Bit 7- PWR – Low Power
This bit allows the PLC to monitor backplane
power. It is set whenever backplane power drops
below the minimum acceptable voltage (4.75 V)
and cleared when the voltage is back in range.
Bit 8 – 15 RSVD - Reserved
These bit positions are reserved for future use.
Bit 16 - HEARTBEAT- Heartbeat
The module toggles this bit between 1 and 0
approximately once per second. It is used as an
indication that the module software is functioning.
Module Control Word (WY3)
The Module Control Word allows the PLC to control global module operation. Currently, there is only one
control option, to reset the module.
Module Control Bits are contained in WY3. Bit 1 is a module reset bit. When the bit is set and all four abort
triggers are set in the Command Control Word, the module will perform a hardware reset. This operation
resets the processor and initiates a complete module restart. It is available for extreme error cases where
simply acknowledging an error or aborting a command does not clear the error.
Command Control and Command Status Words
The command status word and the command control word contain bits that are used to synchronize and
control the execution of module commands. The Command Control Word is located in module word WY4 and
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