Addressing Scheme - Stanley QB Expert Instruction Manual

"Rack" Layout
7 Embedded PLC
Each Alpha Controller has an internal software PLC. This PLC serves to enhance the integration of the Alpha
controller into an end user's plant. The PLC emulates the Allen Bradley SLC-504 controller and uses many of the
same layouts, addressing structures and commands. Alpha Toolbox has a PLC editor but RSLogix500 can also be
used to program ladder logic for the embedded PLC.
7.1 "Rack" Layout
The Alpha controller's PLC has a 4-slot virtual rack layout. There are some differences between a SLC-504 rack
and the Alpha rack. The CPU card does not have its own slot, rather it is taken into account since it is embedded
and cannot be changed. The discreet 24 VDC I/O uses the same slot rather than separate input or output "cards".
The virtual rack is filled as follows:
The 24V DC I/O Module in slot 0 reflects the physical I/O on the Alpha.
The Trailing Fieldbus card in slot #2 uses the M-12 DeviceNet connector on the bottom of the Alpha when the
DeviceNet option is ordered. The DB-9 connector is used when Profibus is ordered. The RJ-45 jacks are used when
Ethernet/IP or Profinet are ordered.
The ModbusTCP card in slot #1 comes installed as standard equipment on Expert Alpha controllers. Each uses
the RJ-45 ETHERNET jack on the bottom of the Alpha. The optional DeviceNet Scanner card in slot #3 can be
configured to auto-map the devices connected to it. This card uses the M-5 DeviceNet connector on the bottom
of the Alpha if this option is ordered.

7.1.1 Addressing Scheme

Use the following syntax when programming to reference any input or output: Type: Slot#.Word/Bit Type can
be Input I or Output O.
For example, if a switch was wired to Pin L, a light was wired to Pin C and logic was required to turn on the light
when the switch was activated, the logic and addressing would look like this:
As ASCII it would be: SOR XIC I:0.0/0 OTE 0.0/0 EOR
See section "6.11 Input and Output Connector" on page 116 for PLC addressing of the 24V DC connector.
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QB Expert Alpha Controller