Chapter 2 Specifications and Functions
2-10
2.4.2 Functions of diagnostic digital input module
1) Relay output
Diagnostic digital output module outputs output signal via the relay to the outside.
2) Diagnosis functions
Digital output module provides diagnostic functions of the following two.
(1) Interal output signal diagnosis : Diagnosing whether internal
output signal circuit is operating property.
(2)
Wire break detection
: Diagnosing whether the disconnection of the external wiring connected to the relay.
Note
In order to detect broken wire, minimum 10mA or higher is required to be current (LOAD) load. If a current of less than 10mA flows, it
will be diagnosed with broken wire.
Refer to
Chapter 3.3 Wiring
in this manual for Wiring of diagnostic digital output module.
The diagnosis result depending on the situation, it is shown in the following table.
Diagnosis
Normal state
Relay failure
Internal H/W failure
Broken wire
Output signal
0
1
0
1
0
1
0
1
Internal output signal
diagnosis
0
0
1
0
0
1
0
0
Wire break detection
0
0
0
1
0
1
0
1
사용자
출력신호
릴레이
동작
릴레이
인가
전류
포토커플러
출력
(
전류흐름
)
전류흐름
출력신호
비교
Off-Delay
회로
출력
출력단선
진단
12ms
이하
최대
25ms
까지는
오류
발생하지
않음
10ms
이하
[Figure 2.1] Timing chart of normal state
Not to detect broken wire
up to 25ms
10ms and lower
12ms and lower
Output signal
Relay
Output current
Photo-coupler output
Broken wire check
Off-delay
Wire break detection diagnosis