Clause
Requirement – Test
Error/fault
Verdict

GENERAL Classification
Class C
Control functions which are intended to prevent special hazards (e.g., explosion of the controlled equipment).
Examples of controls which may include class C functions are: automatic burner controls and thermal cutouts for closed water heater systems (unvented).
The definition in EN 60335-1
software class B
software that includes code intended to prevent hazards if a fault, other than a software fault, occurs in the appliance
software class C
software that includes code intended to prevent hazards without the use of other protective devices
Controls with functions declared as software class C shall have one of the following structures:
常用
-single channel with periodic self-test and monitoring
P
不常用
-dual channel (homogenous) with comparison
N/A
不常用
-dual channel (diverse) with comparison
N/A
Example of measures to control faults/errors in a single chip(8 bit)
-single channel with periodic self-test and monitoring
1
CPU Register including (HCS08).register for
:
1. Accumulator (A)
2. Index Register (H:X)
3. Stack Pointer (SP)
4. Program Counter (PC)
5. Condition Code Register
CPU
Registers
DC fault
Stuck at（a fault model representing an open circuit or a non-varying signal level
These are usually referred to as "stuck open", "stuck at 1" or "stuck at 0".
代表输出常为“1”或“0”
Periodic self-test using walkpat memory test H.2.19.7:
1. Initialize memory to all zeros.
2. Write 1 into location, and read all other locations,
to ensure that they still contain all 0s. Verify location 1.
3. Return location 1 to 0, and continue till the end.
4. Repeat all for the walking 0.
1.2
CPU/instruction decoding and
execution
Periodic self-test using equivalence class test with values inside, outside and at the limits of the specified
ranges:
H.2.18.5
the instructions are grouped as follows:
move instructions
arithmetic instructions
bit and shift instructions
conditional instructions
other instructions
1.3
CPU/ Programme counter
Independent time slot and logical monitoring H.2.18.10.3
DC Fault
1.4
Addressing of variable memory
Periodic self-test using a testing pattern for address lines
5.2
Addressing of invariable memory
Addressing of I/O components
Covered by test of invariable memory
I/O address lines covered by I/O tests
1.5
Data path to variable memory
Covered by test of variable memory see 4.2
5.1
Data path to invariable memory
invariable
Covered by test of invariable memory, see 4.1
Data path to I/O components
Covered by I/O tests, see clause 7
2
Interrupt handling and execution
Covered by test of 2.3
No interrupt or too frequent interrupt
3
Clock
H.2.18.10
Frequency monitoring
4
IC Memory Sample
4.1
Memory
Invariable memory
CRC – single word (8 bits)
4.2
Variable memory
Redundant memory with software comparison
6
External communication,
data and addressing
CRC – double word (16 bit) incorporating data, sources
and destination addresses
*N/A
6.3
Timing
H.2.18.18
Scheduled transmission
*N/A
7
Digital input
Digital output
Testing pattern for inputs
Output verification
H.2.18.22
testing pattern
H.2.18.12
output verification
*
7.2
Analog input, Multiplexer
and A/D-converter
Input comparison (inverted polarity)
H.2.18.8
input comparison
Other components external to the microcomputer（If it has）
8
Monitoring device 监控装置
H.2.18.21
tested monitoring
*N/A
9
PLA (Programmable Logic
Array) 可编程逻辑电路
Periodic self-test and monitoring
H.2.16.7
single channel with periodic self test and monitoring
*N/A
客户要提供的资料：
Type of output waveform if other than sinusoidal
X
电子控制的输出波形。（正弦波除外）
Type of output waveform(s) produced after failure of an electronic device or other circuit component (see item g) of H.27.1.3)
X
电子元件失效后的输出波形（输出脚）
The effect on controlled output(s) after electronic circuit component failure if relevant (item c) of H.27.1.3)
X
电子元件失效后的对输出控制的影响
Category (surge immunity)
X
EMC 抗电涌的等级
Software sequence documentation
X
软件运行顺序的文件（因包括控制原理，控制流程，数据流及时间选择）
Programme documentation
X
编程文件
Software class(es) and structure
D
软件类型的声明
Software fault/error detection time(s) for controls of software classes B or C
X
软件的故障发现时间(可以从编程文件上看出来)
Control response(s) in case of detected fault/error
X
故障发现后，控制的反映时间
Temperature limits of mounting surfaces ( Ts)
Method of mounting control
“D” means the requirement must have supplied document to support.
“X” means the requirement just need declaration from client.
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