BO8.1

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Modbus Registers

Below is a list of available MODBUS registers. The same register numbers are also used by the MIOS-2 protocol.

Modbus Read / Write (0x17) Function

METEL IO modules have implemented the MODBUS function (0x17) Read/Write of Multiple registers. Typically it is required to have two separate requests (and responses) for:

1. Writing of outputs via MODBUS function (0x16) Writing Multiple Registers

2. Reading of inputs via MODBUS function (0x03) Read Holding Registers


This requires a total of 4 frames to be sent over MODBUS. If using 0x17 function only one request is needed for the reading and writing of outputs. This requires a total of 2 frames to be sent over MODBUS.


Default Settings of Communication

Device ID: 1
Baudrate: 115 200
Parity: None
Data bits: 8
Stop bits: 1

Subject Type R/W Value Offset
Device
Identity
Product Type u8[3] R 1002-04
Serial Number u32 R 1005-06
PCB Version u32 R 1007-08
PCB Revision u16 R 1009
FW Version Major u16 R 1010
FW Version Minor u16 R 1011
FW Version - Revision u32 R 1012-13
IF#01 Slot State u16 R 0 = N/A
1 = IF#01 not Inserted
2 = IF#01 Inserted, CRC error
3 = IF#01 Inserted, CRC OK
1021
IF#01 Product Type u8[3] R 1022-24
IF#01 Serial Number u32 R 1025-26
IF#01 PCB Version u32 R 1027-28
IF#01 PCB Revision u16 R 1029
Device
Control
Reset u16 RW 55203 = To Reboot 1201
Bootloader / Application u16 R 0x00A – Application,
0x00B – Bootloader
1203
Restart to Bootloader u16 RW 617 = To Bootloader
else = deactivate
bootloader
1204
Device
Status
Board Power Voltage u16 R 105 = 10,5V 1311
Board Temperature u16 R -200 = -20,0°C
250 = 25,0°C
1321
Subject Channel Type R/W Value Offset
Setting the
Value of
Alarm
Outputs
Balanced Output 1 AO#01 u16 RW 1000 = 1000Ω
0 = 0Ω
6001
Balanced Output 2 AO#02 u16 RW 6002
Balanced Output 3 AO#03 u16 RW 6003
Balanced Output 4 AO#04 u16 RW 6004
Balanced Output 5 AO#05 u16 RW 6005
Balanced Output 6 AO#06 u16 RW 6006
Balanced Output 7 AO#07 u16 RW 6007
Balanced Output 8 AO#08 u16 RW 6008
Alarm
Output
Correction
Settings
Balanced Output 1 offset AO#01 Par. u16 RW 1000 = 1000Ω
0 = 0Ω
6101
Balanced Output 2 offset AO#02 Par. u16 RW 6102
Balanced Output 3 offset AO#03 Par. u16 RW 6103
Balanced Output 4 offset AO#04 Par. u16 RW 6104
Balanced Output 5 offset AO#05 Par. u16 RW 6105
Balanced Output 6 offset AO#06 Par. u16 RW 6106
Balanced Output 7 offset AO#07 Par. u16 RW 6107
Balanced Output 8 offset AO#08 Par. u16 RW 6108
Default
Value of
Alarm
Outputs
Balanced Output 1 default AO#21 Par. u16 RW 1000 = 1000Ω
0 = 0Ω
6121
Balanced Output 2 default AO#22 Par. u16 RW 6122
Balanced Output 3 default AO#23 Par. u16 RW 6123
Balanced Output 4 default AO#24 Par. u16 RW 6124
Balanced Output 5 default AO#25 Par. u16 RW 6125
Balanced Output 6 default AO#26 Par. u16 RW 6126
Balanced Output 7 default AO#27 Par. u16 RW 6127
Balanced Output 8 default AO#28 Par. u16 RW 6128
Subject Channel Type R/W Value Offset
States of
Inputs and
Outputs
Balanced Input 1 DI#01 bit R 0 = inactive
1 = active
3001
Balanced Input 2 DI#02 bit R 3002
Balanced Input 3 DI#03 bit R 3003
COIL Relay DI#12 bit R 3012
Inputs DI#16 - DI#01 u16 R 0x0000 - 0x000F 3001
Balanced Input 1 AI#01 u16 R 1000 = 1000Ω
0 = 0Ω
5001
Balanced Input 2 AI#01 u16 R 5002
Balanced Input 3 AI#01 u16 R 5003
Subject Channel Type R/W Value Offset
Relay and
OC
Outputs
Relay Output 1 DO#01 bit RW 0 = inactive
1 = active
4001
Open Collector 1 DO#02 bit RW 4002
Open Collector 2 DO#03 bit RW 4003
Outputs DO#16 - DI#01 u16 RW 0x0000 - 0x000F 4001

Note: To activate the bootloader, it is necessary to write a value 617 into the registry with an offset 1204 and restart the device.