Mitsubishi Electric MELSEC iQ-R-R04CPU - Safety Diagnostic Function

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33 FUNCTIONS
33.3 Safety Diagnostic Function
33.3 Safety Diagnostic Function
The following lists self-diagnostic functions specific to the Safety CPU.
*1 Self-diagnostics is performed in both Safety CPU and safety function module.
Item
*1
Description Diagnostic timing Error code
Memory diagnosis RAM diagnosis Detects errors occurring at program memory,
device memory, and memory used by the system.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3C20H, 3C21H,
3C22H, 3C2FH,
3C33H
F/W diagnosis Diagnoses whether the firmware stored in the
ROM is corrupt.
• When power is turned off and
on
• When the CPU module is reset
3C10H
Program diagnosis Operation circuit
diagnosis
Detects errors at operation circuits used to
operate safety programs.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3C15H
File verification Detects errors in stored safety programs and
safety parameters.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
2180H, 36E1H,
3C33H, 3C34H
Diagnoses whether safety programs and safety
parameters stored in both the Safety CPU and
safety function module are the same.
• When power is turned off and
on
• When the CPU module is reset
2180H, 3640H
Operation result
verification
Output data
verification
Verifies output results calculated in the Safety
CPU and safety function module.
When executing safety cycle
processing
3E60H
System diagnosis Time monitoring Monitors the execution status of the respective
Safety CPU and safety function module
processing.
Always 3E61H
Microcomputer
diagnosis
Detects microcomputer internal register errors. • When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3C00H, 3C01H
Power supply
voltage monitoring
Power supply voltage
monitoring
Detects voltage errors to prevent operation with
voltage outside the guaranteed operating range.
Always 
(Performs a
shutdown.)
Power supply voltage
monitoring/shutdown
circuit diagnosis
Monitors whether the circuit monitoring the power
supply voltage and circuit used to perform
shutdown are functioning properly.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3E10H, 3E11H
Reset circuit
monitoring
Reset circuit
monitoring diagnosis
Diagnoses whether the reset has been performed
correctly.
• When power is turned off and
on
• When the CPU module is reset
3E12H
Clock stop
detection
Clock diagnosis Detects clock errors (frequency errors). • When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3C16H
CRC calculation
circuit diagnosis
CRC calculation
circuit diagnosis
Diagnoses whether the CRC calculation circuit is
ca
pable of correctly calculating CRC.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3E01H
Module Module OS diagnosis Verifies whether the Safety CPU and safety
function module are functioning normally without
running out of control.
• When power is turned off and
on
• When the CPU module is reset
• When END processing is
performed
3C11H, 3C17H