Rockwell Automation SD3000 Drive Configuration, Programming User Manual
Page 69
2000
Interrupt Status Control Register (Continued)
Bit: 5
Hex Value: 0020H
Sug. Var. Name:
N/A
Range:
N/A
Access:
Read only
UDC Error Code:
N/A
LED:
N/A
Description:
CCLK Counting.
Bit: 6
Hex Value: 0040H
Sug. Var. Name:
N/A
Range:
N/A
Access:
Read/Write
UDC Error Code:
N/A
LED:
N/A
Description:
Enable CCLK on the Multibus Backplane - CCLK must be enabled in the rack for the
UDC module to execute its task(s) and communicate synchronously with the PMI.
Only one module
per rack should enable CCLK.
If CCLK is enabled on multiple modules in the rack, an overlap error
will result (error code 38). Other modules that can enable CCLK include the M/N 57C409, 576421,
and the 57C411. The UDC module uses CCLK to determine when it should run its tasks. CCLK is
also used as the time reference for all UDC modules in the rack so that they are all synchronized to
start at deterministic time periods. If interrupts to the AutoMax Processor are required, register 2001
must be set to the desired value before CCLK is enabled.
Bit: 7
Hex Value: 0080H
Sug. Var. Name:
N/A
Range:
N/A
Access:
Read only
UDC Error Code:
N/A
LED:
N/A
Description:
The Interrupt Enabled bit, when set to one by the operating system, indicates that
a
hardware EVENT has been defined in an AutoMax task. No other programming is required for the
UDC operating system to generate an interrupt in the interval defined in register 2001.
Bit: 15
Hex Value: 8000H
Sug. Var. Name:
N/A
Range:
N/A
Access:
Read only
UDC Error Code:
N/A
LED:
N/A
Description:
The Interrupt Status bit, when set to one, indicates that an interrupt is being generated
at this time.
2001
Scans Per Interrupt Register
Hex Value:
N/A
Sug. Var. Name:
SPI%
Range:
N/A
Access:
Read/Write
UDC Error Code:
N/A
LED:
N/A
Description:
The Scans Per Interrupt register contains the number of times a UDC task is to be
scanned between updates of the Nth scan application registers. Note that you must write the desired
value to this register before you turn on CCLK. The default value is zero (Le., not applicable because
an interrupt is not being used but is updated each scan). One is an allowable value. If a hardware
EVENT is defined in an AutoMax application task, this register will also specify when the interrupt oc-
curs, i.e., every Nth scan. See chapter 4 and figure 4.3 for more information on interrupts. Note that
in this register, one scan is a complete scan of both tasks A and B.
3-49