System Relays (Sr) - Panasonic ELC500 User Manual

9.6

System Relays (SR)

ELC500 uses the following system relays (SR).
These system relays can be used in programs.
Device No. Name
SR0 Self-diagnostic error flag
SR1 Unit alarm occurrence
SR2 Unit error occurrence
SR3 Unit warning occurrence
Unit verification error
SR4
occurrence
Unit installation error
SR5
detection
Operation error flag
SR7
(hold type)
Operation error flag
SR8
(latest type)
SR9 Carry flag (CY flag)
SRA > flag
SRB = flag
SRC < flag
Support timer instruction
SRD
flag
SRE All error alarms relay
Constant scan error
SRF
flag
Turns on when a self-diagnosis error occurs. Self-diagnosis error codes are
saved in the system data register SD0.
Turns on when a unit alarm is detected. The slot number of the unit where
an alarm has occurred is saved in the system data register SD1.
Turns on when a unit error is detected. The slot number of the unit where an
error has occurred is saved in the system data register SD2.
Turns on when a unit warning is detected. The slot number of the unit where
a warning has occurred is saved in the system data register SD3.
Turns on when an I/O verification error is detected. The slot number of the
unit where an I/O verification error has occurred is saved in the system data
register SD4.
Turns on when a unit installation error is detected. The slot number of the
unit where an I/O verification error has occurred is saved in the system data
register SD5.
Turns on when an operation error occurs after the unit has started
operating, and remains on while the unit operation continues. The PB
number where an error has occurred is saved in the system data SD7, and
the address is saved in system data registers SD8 to SD9. It indicates the
first operation error that has occurred.
Turns on every time an operation error occurs. The PB number where an
operation error has occurred is saved in the system data register SD10, and
the address is saved in system data registers SD11 to SD12. Every time a
new error occurs, the data are updated. It does not turn off even if the
instruction is normally completed after the occurrence of the error(s). In
order to check if any error has occurred in a specific instruction, either see
address data saved in the SD, or clear error flags using ERR instruction
immediately before the specific instruction, and check flags immediately
after executing the instruction.
Used in shift instruction and rotate instruction with a carry flag. The flag can
also be operated in carry set instruction and carry reset instruction. It is not
set in overflow or underflow of operation results.
Turns on when an error occurs during the execution of Ethernet
communication instruction. The error code is stored in the system data
register SD29.
Executes comparison instruction, and turns on if the result is larger.
Executes comparison instruction, and turns on if the result is equal.
Executes operation instruction, and turns on if the result is '0'.
Executes comparison instruction, and turns on if the result is smaller.
Turns on after support timer instruction (SPTM) is executed and
subsequently specified time has passed. Turns off when execution
conditions go off.
Turns on when any of the error alarm relays E0 to E4095 turns on.
Turns off once all of the error alarm relays go off.
Turns on if scan time exceeds the setting during constant scan. It
also turns on if '0' is set in FP7 configuration.
175
ELC500 Control unit
Description