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DL8 USERS
MANUAL EM-7691-B Rev.24
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Data and Control Functions
CODE
NAME
01
Read Coil Status
✓
Digital output from the slave
02
Read Input Status
✓
Status of digital inputs to the slave
03
Read Holding Registers
✓
General purpose register within the slave
04
Read Input Registers
✓
Collected data from the field by the slave
05
Force Single Coil
✓
Digital output from the slave
06
Preset Single Registers
✓
General purpose register within the slave
07
Read Exception Status
08
Diagnostics
09
Program 484
10
Poll 484
11
Fetch Comm. Event Counter
12
Fetch Comm. Event Log
13
Program Controller
14
Poll Controller
15
Force Multiple Coils
✓
Digital output from the slave
16
Preset Multiple Registers
✓
General purpose register within the slave
17
Report slave ID
slave type / ‘RUN’ status
18
Program 884/M84
19
Reset Comm. Link
20
Read General Reference
21
Write General Reference
22
Mask Write 4X Register
23
Read/Write 4X Register
24
Read FIFO Queue
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Exception Codes
CODE
NAME
01
Illegal Function
✓
Function code is not allowable for the slave
02
Illegal Data Address
✓
Address is not available within the slave
03
Illegal Data Value
04
slave Device Failure
05
Acknowledge
06
slave Device Busy
07
Negative Acknowledge
08
Memory Parity Error
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Diagnostic Subfunctions
CODE
NAME
00
Return Query Data
01
Restart Comm. Option
02
Return Diagnostic Register
03
Change ASCII Input Delimiter
04
Force Listen Only Mode