AI8.1

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
Measured Voltage Values	Analog Input 1	AI#01	s16	R	1000 = 1 V 0 = 0 V -1000 = -1 V 32767 = upper range limit exceeded -32767 = lower range limit exceeded	5001
	Analog Input 2	AI#02	s16	R		5002
	Analog Input 3	AI#03	s16	R		5003
	Analog Input 4	AI#04	s16	R		5004
	Analog Input 5	AI#05	s16	R		5005
	Analog Input 6	AI#06	s16	R		5006
	Analog Input 7	AI#07	s16	R		5007
	Analog Input 8	AI#08	s16	R		5008

Subject		Channel	Type	R/W	Value	Offset
Measured Current Values	Analog Input 1	AI#11	s16	R	1000 = 1 V 0 = 0 V -1000 = -1 V 32767 = upper range limit exceeded -32767 = lower range limit exceeded	5011
	Analog Input 2	AI#12	s16	R		5012
	Analog Input 3	AI#13	s16	R		5013
	Analog Input 4	AI#14	s16	R		5014
	Analog Input 5	AI#15	s16	R		5015
	Analog Input 6	AI#16	s16	R		5016
	Analog Input 7	AI#17	s16	R		5017
	Analog Input 8	AI#18	s16	R		5018

Subject		Channel	Type	R/W	Value	Offset
Setting Input Ranges	Analog Input 1	AI#21	u16	RW	1 = ±10 V / ±30 mA 2 = ±5 V / ±20 mA 3 = ±2.5 V / ±10 mA (1) - Default	5121
	Analog Input 2	AI#22	u16	RW		5122
	Analog Input 3	AI#23	u16	RW		5123
	Analog Input 4	AI#24	u16	RW		5124
	Analog Input 5	AI#25	u16	RW		5125
	Analog Input 6	AI#26	u16	RW		5126
	Analog Input 7	AI#27	u16	RW		5127
	Analog Input 8	AI#28	u16	RW		5128

Subject		Channel	Type	R/W	Value	Offset
States of Relay Outputs	COIL Relay 1	DI#01	bit	R	0 = inactive 1 = active	3001
	COIL Relay 2	DI#02	bit	R		3002
	COIL Relay 3	DI#03	bit	R		3003
	COIL Relay 4	DI#04	bit	R		3004
	Inputs	DI#16 - DI#01	u16	R	0x0000 - 0x000F	3001

Subject		Channel	Type	R/W	Value	Offset
Relay Outputs	Relay Output 1	DO#01	bit	RW	0 = inactive 1 = active	4001
	Relay Output 2	DO#02	bit	RW		4002
	Relay Output 3	DO#03	bit	RW		4003
	Relay Output 4	DO#04	bit	RW		4004
	Outputs	DO#16 - DO#01	u16	RW	0x0000 - 0x000F	4001

Subject		Channel	Type	R/W	Value	Offset
Voltage Correction	Analog Input 1	AI#01	s16	RW	1000 = 1 V 0 = 0 V -1000 = -1	5101
	Analog Input 2	AI#02	s16	RW		5102
	Analog Input 3	AI#03	s16	RW		5103
	Analog Input 4	AI#04	s16	RW		5104
	Analog Input 5	AI#05	s16	RW		5105
	Analog Input 6	AI#06	s16	RW		5106
	Analog Input 7	AI#07	s16	RW		5107
	Analog Input 8	AI#08	s16	RW		5108

Subject		Channel	Type	R/W	Value	Offset
Current Correction	Analog Input 1	AI#11	s16	RW	1000 = 1 V 0 = 0 V -1000 = -1	5111
	Analog Input 2	AI#02	s16	RW		5112
	Analog Input 3	AI#12	s16	RW		5113
	Analog Input 4	AI#12	s16	RW		5114
	Analog Input 5	AI#13	s16	RW		5115
	Analog Input 6	AI#14	s16	RW		5116
	Analog Input 7	AI#15	s16	RW		5117
	Analog Input 8	AI#16	s16	RW		5118

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