ProSoft Technology CLX-APACS - Manual (Page 44)

Page 38 QTS- CLX-APACS March 2015
Accessing Data
Required Connections
In master mode, the QTS-CLX-APACS does not begin scanning the I/O bus until all
ControlLogix connections to the module are present.
In monitor mode, the module does not wait for the ControlLogix connections.
I/O Data
Use the aliases created by ClxApacsMonCfg or ClxApacsMasCfg to access data to
ensure that you are using the correct address.
Each discrete point is mapped to a SINT in the ControlLogix. The data value is the low
bit in the SINT. Use the low bit of the Alias to read or change the data value.
Each analog point is mapped to a REAL in the ControlLogix.
Program/Run
In master mode, the QTS-CLX-APACS does not scan I/O in program mode.
Diagnostic Data
The QTS-CLX-APACS maintains diagnostic counters and other diagnostic status
information.
SlotStatus Bits
The QTS-CLX-APACS maintains an array of bits that indicate the status of the APACS
modules.
Use the slot status bits to determine when you can access data from a module. Some
APACS modules take several seconds to go online.
In master mode, the bit is 0 if the module has good communication status and is 1 if the
associated module is in error or is not responding.