HollySys LK Series User Manual

Chapter 7 IO Module
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Diagnostic information of LK511 up to 16 bytes, wherein 2 bytes are device-related diagnosis, 2 bytes
are identification diagnosis and 12 bytes are channel diagnosis. The four channels in LK511, the
diagnosis information for each channel 3 bytes. Diagnosis information diagram refer to Figure 7-26.
 Device diagnosis information
Device diagnosis data 0x02, 0x00 indicates the current device without any fault.
Device diagnosis data 0x02, 0x01 indicates that the current device has channel fault.
Device diagnosis data 0x02, 0x02 indicates that the current device checking data error.
Device diagnosis data 0x02, 0x03 indicates that the current device have both channel fault and
checking data error.
 Identification diagnosis information
The 2-byte identification diagnosis information is 0x42, 0x01 when diagnosis information is
reported.
 Channel diagnosis information
Channel diagnosis information as shown in Table 7-78.
Table 7-78 Specifications for LK511 Channel Diagnosis Information
Diagnosis Information
Meaning
Bit
Bit7
Bit6
Bit5
Bit4~
Bit0
The first byte
Head
0x80
Decimal online value 128
The second
byte
I/O type/channel
10
(Output)
（
Channel
）
Fault channel no. 1~4
Decimal online value 128~131
The third
byte
Channel data
type/fault type
101 (Word)
6
Line broken, Decimal online value is
166
18
Channel output fault, Decimal
online value is 178
0
Channel fault recovery, Decimal
online value is 160
Example:
Channel diagnosis data 0x80, 0x82, 0xA6 indicates that channel 3 has line broken fault.
The LK511 module is designed for a channel read-back diagnosis circuit for its hardware. The channel
output data is uploaded to the CPU module by means of read-back. The user can access to and check
the output signal at any time, thus further improving the reliability in AO control. In the meantime, the
LK511 module automatically detects the output status of the channel via the read-back data, realizing
fault diagnosis.
The 0~4 mA range of each channel is the read-back circuit dead zone. Therefore, for the 0~21 mA
range, the effective read-back diagnosis range is 4~21 mA. For the current in the 0~4 mA range, the
read-back diagnosis of the module becomes invalid automatically. For a 4~20 mA range, read-back
diagnosis holds valid in the full range.
The LK511 can conduct line broken and output fault diagnosis to the output channel via the read-back
value. The CPU module compares the read-back value and theoretical one, diagnoses the channel
status and reports the diagnosis data. The rules are given below:

HollySys LK Series Specifications

General

Brand	HollySys
Model	LK Series
Category	Controller
Language	English