Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 406)

Reference
Appendix B
Programming Reference
B–11
Address Bit Classification Description
S7 Suspend Code Status When a non-zero value appears in S:7, it indicates that the SUS
instruction identified by this value has been evaluated as true
and the Suspend Idle mode is in effect. This pinpoints the
conditions in the application that caused the Suspend Idle
mode. This value is not cleared by the controller.
Use the SUS instruction with startup troubleshooting, or as
runtime diagnostics for detection of system errors.
S8 to S12 Reserved NA NA
S13 and S14 Math Register Status Use this double register to produce 32-bit signed divide and
multiply operations, precision divide or double divide
operations, and 5-digit BCD conversions.
These two words are used in conjunction with the MUL, DIV,
DDV, FRD, and TOD math instructions. The math register
value is assessed upon execution of the instruction and
remains valid until the next MUL, DIV, DDV, FRD, or TOD
instruction is executed in the user program.
An explanation of how the math register operates is included
with the instruction definitions.
If you store 32-bit signed data values, you must manage this
data type without the aid of an assigned 32-bit data type. For
example, combine B3:0 and B3:1 to create a 32-bit signed data
value. We recommend that you start all 32-bit values on an
even or odd word boundary for ease of application and viewing.
Also, we recommend that you design, document, and view the
contents of 32-bit signed data in either the hexadecimal or
binary radix.
When an STI, high-speed counter, or Fault Routine interrupts
normal execution of your program, the original value of the
math register is restored when execution resumes.
S15L
➀
DF1 Node
Address Status This byte value contains the node address of your processor on
the DF1 link. It is used when executing Message (MSG)
instructions over the DF1 link. The default node address of a
processor is 1. Valid node addresses are 0–254. To change a
processor node address you must use a programming device.
S15H
➀
DF1 Baud Rate Status This byte value contains a code used to select the baud rate of
the processor on the DF1 link.
The controller baud rate options are:
•
300
•
600
•
1200
•
2400
•
4800 (MicroLogix 1000 Series D or later discrete and
all MicroLogix 1000 analog only)
•
9600 (default)
•
19200
•
38400 (MicroLogix 1000 Series D or later discrete and
all MicroLogix 1000 analog only)
To change the baud rate from the default value you must use
a programming device.
S16L
➀
DH-485 Node
Address Status This byte value contains the node address of your processor on
the DH-485 link. Each device on the DH-485 link must have a
unique address between the decimal values 1–31. To change a
processor node address, you must use a programming device.
➀
Address is not shown in HHP data monitor.