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CHAPTER 3
CPU MODULE FUNCTIONS
This chapter describes the functions for a CPU module.
3.1
Function List
The following table lists the functions of the LCPU.
(To the next page)
Item
Description
Reference
Boot operation
Transfers data stored on an SD memory card to the program memory or the
standard ROM at power-on or reset.
Constant scan
Executes a program at a set interval regardless of its scan time.
Watchdog timer (WDT)
Monitors operational delays caused by hardware failure or program error of the
CPU module.
Latch function
Holds the device data of the CPU module.
Initial device value
Registers data used in programs without programs.
Service processing setting
Specifies the service processing count or time to be executed in END processing.
Output mode at operating status change
(STOP to RUN)
Sets the output mode when operation status of the CPU module is changed from
STOP to RUN.
Input response time setting
Sets input response time values for modules such as the input module.
Error time output mode setting
Sets whether to clear or hold the output status to each module at the time of a stop
error of the CPU module.
PLC operation mode at H/W error setting
Sets a operation mode of the CPU module when a hardware error (CPU module
detects SP.UNIT DOWN) occurred in an intelligent function module.
File password 32
Prohibits writing/reading data to/from each file in the CPU module.
Remote Password
Prevents unauthorized access from external devices using the built-in Ethernet
function or serial communication module.
Remote RUN/STOP
Changes the CPU module status to RUN or STOP without using switches.
Remote PAUSE
Changes the CPU module status to PAUSE without using switches. Outputs (Y) are
held.
Remote RESET
Resets the CPU module when it is in the STOP status, without using switches.
Remote latch clear
Clears latch data of the CPU module when the module is in the STOP status,
without using switches.
Scan time measurement
Measures the execution time of the specified steps in a program.
Program list monitor
Displays the scan time and execution status of the program being executed.
Interrupt program list monitor
Displays the number of executions of an interrupt programs.
Device monitor/test
Monitors and/or tests the local devices of the specified program.
External input/output forced on/off
Forcibly turns on/off the external input/output of the CPU module.
Executional conditioned device test
Changes a device value for the specified step of a program.
Sampling trace
Continuously collects data of the specified device at a specified timing.
Online change (ladder mode)
Writes programs while the CPU module is in the RUN status.
Online change (files)
Collectively writes files while the CPU module is in the RUN status.
Debug from multiple programming tools
Enables simultaneous debugging from multiple programming tools.
Self-diagnostic function
Self-diagnoses the CPU module to see whether an error exists or not.
Error clear
Clears continuation errors by error type. User can specify continuation errors to
clear.
LED control function
Sets the timing to turn off and indication of the LEDs located on the front of the CPU
module.
Module error collection function
Lists descriptions of errors occurred in the intelligent function module.
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