Horner APG QX751 OCS - Manual (Page 65)

MAN0890-02-EN CH. 11
August 20, 2009 Page 65 of 96 ECN # 979
%K Registers
A %K Register is a non-retentive 1-bit memory location (contact), used to store the state of a
function key on the QX751keypad. If the function keys are set for momentary mode, a
function key’s associated %K register will be ON as long as the function key is pressed. If the
function keys are set for toggle mode, a function key’s associated %K register will toggle
each time the function key is pressed.
%D Registers
A %D Register is a non-retentive 1-bit memory location (coil), which can be turned ON by
Ladder Code to cause the corresponding User or Alarm Screen to be displayed.
SmartStack I/O Registers
SmartStack I/O Registers (%I, %Q, %AI and %AQ) give the user access to the SmartStack I/O
Module data. This data can be accessed via User Screens and/or by Ladder Code.
%I Registers
A %I Register is a 1-bit memory location, which is normally used to store the state of one of
the digital inputs associated with a SmartStack I/O module. When used in this way, %I
registers are non-retentive. All extra %I registers, which are not associated with SmartStack
inputs, are retentive, and can be used just like %M registers.
%Q Registers
A %Q Register is a non-retentive 1-bit memory location, which is normally used to store the
state of one of the digital outputs associated with a SmartStack I/O module.
%AI Registers
A %AI Register is a 16-bit memory location, which is normally used to store the value of one
of analog inputs associated with a SmartStack I/O module. When used in this way, %AI
registers are non-retentive. All extra %AI registers, which are not associated with
SmartStack inputs, are retentive, and can be used just like %R registers.
%AQ Registers
A %AQ Register is a non-retentive 16-bit memory location, which is normally used to store
the value of one of the analog outputs associated with a SmartStack I/O module.
Global Data I/O Registers
Global Data I/O Registers (%IG, %QG, %AIG and %AQG) give the user access to the CsCAN
Network Port’s Global I/O data. This data can be accessed via User Screens and/or by Ladder
Code. The CsCAN Network is based on the Bosch Control Area Network (CAN), and implements
the CsCAN Protocol which is designed to take maximum advantage of the global data
broadcasting capability of CAN. Using this network protocol, up to 64 nodes can be linked
without repeaters, and up to 253 nodes can be linked by using 3 repeaters. For more information
regarding CsCAN Protocol, refer to the CsCAN Protocol Specification document.
%IG Registers
A %IG Register is a retentive 1-bit memory location, which is normally used to store a global
digital state obtained from another node on the network.
%QG Registers
A %QG Register is a retentive 1-bit memory location, which is normally used to store a
digital state to be sent as global data to another node on the network.