ELC500 Control unit
178
System Data Registers (SD)
9.7
ELC500 uses the following system data registers (SD).
These system data registers can be used in programs.
Device No.
name
Description
SD0 *1
Self-diagnostic error code
Stores the error code when a self-diagnosis error occurred.
SD1 *1
Alarm Occurrence Unit Slot No.
Saves the slot number of the unit where an alarm has occurred.
SD2 *1
Error Occurrence Unit Slot No.
Saves the slot number of the unit where an error has occurred.
SD3 *1
Warning Occurrence Unit Slot No.
Saves the slot number of the unit where a warning has occurred.
SD4 *1
Verification Error Occurrence
Unit Slot No.
Saves the slot number of the unit where a verification error has
occurred.
SD5 *1
Installation error detection slot No.
Saves the slot number of the unit where an installation error was
detected.
SD7
Operation error occurrence PB
number (hold type)
Saves the PB number where the first operation error occurred
after the unit has started operating.
SD8
Operation error occurrence
address (hold type)
(32-bit lower-level address)
Saves the address where the first operation error occurred after
the unit has started operating. Perform monitoring using 32-bit
data.
SD9
Operation error occurrence
address (hold type)
(32-bit higher-level address)
SD10
Operation error occurrence PB
number (latest type)
Saves the PB number where an operation error occurred. Every
time a new error occurs, the data are updated. The value '0' is
recorded at the start of the scan.
SD11
Operation error occurrence
address (latest type)
(32-bit lower-level address)
Saves the address where an operation error occurred. Every
time a new error occurs, the data are updated. The value '0' is
recorded at the start of the scan. Perform monitoring using 32-bit
data.
SD12
Operation error occurrence
address (latest type)
(32-bit higher-level address)
SD19
RING counter 2.5 ms
The saved value is increased by one every time the respective
time unit has passed. (H0 to HFFFF)
Current values of SD19 to SD21 can only be read when SD19 to
SD21 are directly specified and read by MV instruction. The
scan start value is read by other instructions.
SD20
RING counter 10 μs
SD21
RING counter 100 μs
SD22
Scan time (current value)
Saves the current value.
[Saved value (decimal)] x 10 μs
scan time indication: Indicates
operation cycle time in the RUN
mode only. Max. and Min. values
are cleared at switching between
the RUN mode and the
STOP/PROG. mode.
SD23
Scan time (minimum value)
Stores the minimum
value.
SD24
Scan time (maximum value)
Saves the maximum
value.
SD27
Interval for PB for execution at a
specified interval
Saves interval for PB for execution at a specified interval.
SD29
Ethernet communication error code
Saves the error code when the Ethernet communication
instruction is executed.
*1 SD0 to SD5 are available only when the corresponding system relays SR0 to SR5 are on.