< 8. Appendix>
8-6
TI 34M6A82-01E
2nd Edition : Nov. 1, 2002-00
8.2 Special Register (Z)
Special registers have specific functions such as indicating operation or error states of
the programmable controller.
Sequence Operation State
This type of registers indicates sequence operation states.
Table
Sequence Operation State
Type
Sequence operation state
No. Name
Value
Description
Z001
Scan time
(Run mode)
Latest scan time
Stores the latest scan time on a 100
µ
s
basis.
Z002
Minimum scan time
(Run mode)
Minimum scan time
Stores the latest scan time on a 100-
µ
s basis if it is shorter than the
minimum scan time.
Z003
Maximum scan time
(Run mode)
Maximum scan time
Stores the latest scan time on a 100-
µ
s basis if it is longer than the
maximum scan time.
Z004
Scan time
(Debug mode)
Latest scan time
Stores the latest scan time on a 100-
µ
s basis.
Z005
Minimum scan time
(Debug mode)
Minimum scan time
Stores the latest scan time on a 100-
µ
s basis if it is shorter than the
minimum scan time.
Z006
Maximum scan time
(Debug mode)
Maximum scan time
Stores the latest scan time on a 100-
µ
s basis if it is longer than the
maximum scan time.
Z007
Peripheral processing
scan time
Latest scan time
Stores the latest scan time on a 100-
µ
s basis.
(Tolerance: Scan time for one control
process)
Z008
Minimum peripheral
processing scan time
Minimum scan time
Stores the latest scan time on a 100-
µ
s basis if it is shorter than the
minimum scan time. (Tolerance: Scan
time for one control process)
Z009
Maximum peripheral
processing scan time
Maximum scan time
Stores the latest scan time on a 100-
µ
s basis if it is longer than the
maximum scan time. (Tolerance: Scan
time for one control process)
CAUTION
- Do not write to special registers (Z) that are not designated as write-enabled
including registers that not listed in the above table (e.g. Z010 to Z016) because
they are used by the CPU module system. If you write to these registers
inadvertently, an operation might stop.
- Do not specify a special register (Z) with index modification as an output destination.
Otherwise, an instruction processing error will occur during execution.
- Do not specify special registers (Z) as output destinations in continuous transfer
ladder instructions and table output ladder instructions. Otherwise, an instruction
processing error will occur during execution.
Continuous transfer instructions: Block Move (BMOV) instruction,
Block Set (BSET) instruction,
String Move (SMOV) instruction, etc.
Table output instructions:
Read User Log (ULOGR) instruction,
FIFO Write (FIFWR) instruction, etc.
