Horner APG QX751 OCS - Manual (Page 38)

CH. 8 MAN0890-02-EN
August 20, 2009 Page 38 of 96 ECN # 979
8.5
QX751 Register Mapping
Note: Unlike a typical OCS, you can assign registers for the high speed feature in the QX751.
Table 8.5 – I/O Register Map for QX751 High Speed (BP43 Required)
Starting Analog In
Default Reference
Offset with Respect to
Analog In field
Function
%AI0385-0386 Offset 0 and Offset 1
Counter/Frequency Accumulator for
CNT 1
%AI0387 Offset 2 Accumulator for CNT 2
%AI0389-0390 Offset 3 and Offset 4 Latch Register for CNT 1
Starting Analog Out
Default Reference
Offset with Respect to
Analog Out field
Function
%AQ0385-0386 Offset 0 and Offset 1 PreLoad Register for CNT 1
%AQ0387-0390 Offset 2 and Offset 3 Reserved
%AQ0391 Offset 4 Out 1 Duty Cycle (0 to 32000)
%AQ0392 Offset 5 Out 2 Duty Cycle (0 to 32000)
%AQ0393 Offset 6
Out 1 Frequency (0 to 65,535) Zero is
manual output control
%AQ0394 Offset 7
Out 2 Frequency (0 to 65,535) Zero is
manual output control
Starting Digital In
Default Reference
Offset with Respect to
Digital In field
Function
%I1537-1539
Offset 0 and Offset 1,
2
External input states
%I1540 Offset 3 Overflow status flag for CNT 1
%I1541 Offset 4 Underflow status flag for CNT 1
Starting Digital Out
Default Reference
Offset with Respect to
Digital Out field
Function
%Q1537 Offset 0 Latch trigger for CNT 1
%Q1538 Offset 1 Preload trigger for CNT 1
%Q1539 Offset 2 Clear trigger for CNT 1
%Q1540 Offset 3 Preload disable for CNT 1 (1-Disable)
%Q1541 Offset 4 Counter disable for CNT 1
%Q1542 Offset 5 Latch disable for CNT 1 (1-Disable)
%Q1543 Offset 6 Underflow/overflow reset (1-Reset)
%Q1544 Offset 7 Counter Direction for CNT 1 (1-Up)
%Q1545 Offset 8 Clear trigger for CNT 2
%Q1546 Offset 9 Counter disable for CNT 2 (1-Disable)
%Q1547 Offset 10 Counter direction for CNT 2 (1-Up)
8.5.1 PWM Examples
Example 1
To get a 50% Duty Cycle @ 10 kHz waveform:
Set %AQ391 = 16,000
Set %AQ393 = 10,000
*Note: This output will appear on both the TTL
OUT1 output pin and the 24VDC OUT1 output
pin. Example 2
To get a 25% Duty Cycle @ 1 kHz waveform:
Set %AQ392 = 8,000
Set %AQ394= 1,000
*Note: This output will appear on both the TTL
OUT2 output pin and the 24VDC OUT2 output
pin.