3. MODBUS Communication

After enabling MODBUS communication and turning on the automatic data collection task for the target machine/group (see the Bivrost Gateway Manual 5.3.1.2. Task Settings and 5.4.1.2. Group Task Settings), the gateway stores the automatic data collection task results in the corresponding register addresses based on the MODBUS protocol. The MODBUS communication address is <Gateway IP>, and the port is 502. To use MODBUS communication, the machine tool must have a slave ID configured (see the Bivrost Gateway Manual 5.3.1.5. Advanced Settings); by default, the last segment of the IP address is used as the slave ID. For example, if the machine tool’s IP is 192.168.100.2, its default slave ID is 2. The slave ID cannot be set to 0 (0 is reserved for the gateway), and the slave IDs of all machine tools connected under the same gateway (default: the last segment of the IP) must be unique from one another; otherwise data identification errors will occur. Users can configure the MODBUS service by following the instructions in the Bivrost Gateway Manual 5.6.2. MODBUS Configuration.

Note

The gateway’s MODBUS server register addresses are 0-based. If the client uses 1-based addressing, add 1 to the corresponding address.

3.1. Machine-Related Data

The MODBUS data addresses are as follows:

Address	Name	Data Type	Unit	Remarks
400010	Connection status	UInt16	-	1-Connected;2-Disconnected;3-Error
400011	Alarm count	UInt16	count	Current number of alarms
400012	CNC operating status	Int16	-	Current operating status code, see Operating Status
400013	Cumulative alarm count	UInt32	count
400015	Cumulative alarm time	UInt32	seconds
400040~400075	Axis 1 to Axis 18 name	String(4)	-	Converted to a 4-byte array (2 register addresses) using the encoding set in the MODBUS configuration.
400100	Machining count	UInt32	pieces	Machining count obtained from the machine tool’s system
400102	Spindle override	Float	%	Spindle speed override
400104	Actual spindle speed	Float	same as machine setting
400106	Feed override	Float	%	Feed rate override
400108	Actual feed rate	Float	same as machine setting
400110~400115	Spindle 1 to Spindle 3 load	Float	%
400120	Rapid feed override	Float	%
400122	Commanded feed rate	Float	same as machine setting
400124	Commanded spindle speed	Float	same as machine setting
400172	Cumulative power-on time 1	Int32	minutes	See 1.2.24. TimeData: Machine Time Data for how the time is calculated. If the value is -2147483648, it indicates the machine tool’s system model does not support this time data.
400174	Cumulative power-on time 2	Int32	milliseconds
400176	Current power-on time 1	Int32	minutes
400178	Current power-on time 2	Int32	milliseconds
400180	Cumulative running time 1	Int32	minutes
400182	Cumulative running time 2	Int32	milliseconds
400184	Current running time 1	Int32	minutes
400186	Current running time 2	Int32	milliseconds
400188	Cumulative machining time 1	Int32	minutes
400190	Cumulative machining time 2	Int32	milliseconds
400192	Current machining time 1	Int32	minutes
400194	Current machining time 2	Int32	milliseconds
400196	Last cycle time 1	Int32	minutes
400198	Last cycle time 2	Int32	milliseconds
400200	Current cycle time 1	Int32	minutes
400202	Current cycle time 2	Int32	milliseconds
400204	Current cutting time 1	Int32	minutes
400206	Current cutting time 2	Int32	milliseconds
400208	Remaining cycle time 1	Int32	minutes
400210	Remaining cycle time 2	Int32	milliseconds
400220	Current tool number	String(16)	-	Converted to a 16-byte array (8 register addresses) using the encoding set in the MODBUS configuration.
400228	Running program name	String(32)	-	Name of the currently executing subprogram
400244	Main program name	String(32)	-	Name of the current main program
400260	Running program block sequence number	String(16)	-	Sequence number of the currently executing subprogram block
400268	Current program block	String(70)	-	Content of the currently running program block
400498	Current machining count	UInt32	pieces	Machining count within the current monitoring period
400500	Cumulative machining count	UInt32	pieces
400502	Shutdown time	UInt32	seconds
400504	Emergency stop time	UInt32	seconds
400506	Standby time	UInt32	seconds
400508	Automatic running time	UInt32	seconds
400510	Setup time	UInt32	seconds
400512	Machine monitored utilization rate	Float	%
400520	Cumulative shutdown time	UInt32	seconds
400522	Cumulative emergency stop time	UInt32	seconds
400524	Cumulative standby time	UInt32	seconds
400526	Cumulative automatic running time	UInt32	seconds
400528	Cumulative setup time	UInt32	seconds
400546	Last takt time	UInt32	seconds
400600	Program stack	String(128)	-	Converted to a 128-byte array (64 register addresses) using the encoding set in the MODBUS configuration.
400664	Current tool offset number	String(16)	-
400900	Preset power	Float	%	Preset power of the laser cutting machine
400902	Actual power	Float	%	Actual power of the laser cutting machine
401100~401135	Axis 1 to Axis 18 load	Float	%
401136~401171	Axis 1 to Axis 18 machine coordinate	Float	same as machine setting
401172~401207	Axis 1 to Axis 18 relative coordinate	Float	same as machine setting
401208~401243	Axis 1 to Axis 18 remaining distance	Float	same as machine setting
401244~401279	Axis 1 to Axis 18 absolute coordinate	Float	same as machine setting
401400~401405	Spindle 1 to Spindle 3 cumulative overload time	UInt32	milliseconds
401410~401445	Axis 1 to Axis 18 cumulative overload time	UInt32	milliseconds
405000	Alarm 1	String(200)	-	Includes alarm content, time, and level
405100	Alarm 2	String(200)	-	Same as above
405200	Alarm 3	String(200)	-	Same as above
405300	Alarm 4	String(200)	-	Same as above
405400	Alarm 5	String(200)	-	Same as above
420000~429999	PLC data bits 1 to 10000	UInt16	-	PLC task data and external PLC task data, with PLC task data first followed by external PLC task data, arranged in task order. 32-bit data, 64-bit data, and String-type data are converted to UInt16 using the method set in the MODBUS configuration.

Note 1

The cumulative alarm count and cumulative machining count are the accumulated alarm count and machining count since the gateway started automatically collecting data from this device. These two values are stored in the gateway, bound to the machineID (i.e., the last two segments of the machine tool’s IP address), and are never reset.

Note 2

400502-400510: the machine’s state times are the durations of each state within the monitoring period. 400512: the machine’s utilization rate is the utilization rate within the monitoring period. See the Bivrost Gateway Manual 6.1.1. Machine OEE Data for details.

Note 3

String(200) means this string is converted to a 200-byte array using the configured encoding (see the Bivrost Gateway Manual 5.6.2. MODBUS Configuration), which corresponds to 100 MODBUS register addresses (UInt16).

Note 4

The last takt time is monitored by the gateway’s machine takt data task. If the gateway restarts and the first takt cycle has not yet finished, this value is 0. The last takt time is defined the same way as the last cycle time, but the former is calculated by the gateway and is supported by any machine whose output and status can be tracked, while the latter is provided by the machine tool itself and is only supported by some machines.

3.2. Group-Related Data

Group-related data is stored uniformly under slave ID 0. The data addresses are as follows:

Address	Name	Data Type	Unit	Remarks
400100	Group 1 cumulative machining count	UInt32	pieces
400102	Current number of shut-down machines in Group 1	Int16	units
400103	Current number of emergency-stopped machines in Group 1	Int16	units
400104	Current number of standby machines in Group 1	Int16	units
400105	Current number of automatically running machines in Group 1	Int16	units
400106	Current number of machines in setup in Group 1	Int16	units
400110	Group 1 shutdown time	UInt32	seconds
400112	Group 1 emergency stop time	UInt32	seconds
400114	Group 1 standby time	UInt32	seconds
400116	Group 1 automatic running time	UInt32	seconds
400118	Group 1 setup time	UInt32	seconds
400120	Group 1 monitored utilization rate	Float	%
400130	Group 1 cumulative shutdown time	UInt32	seconds
400132	Group 1 cumulative emergency stop time	UInt32	seconds
400134	Group 1 cumulative standby time	UInt32	seconds
400136	Group 1 cumulative automatic running time	UInt32	seconds
400138	Group 1 cumulative setup time	UInt32	seconds
400200~400299	Group 2 (corresponding addresses are Group 1’s addresses + 100)
……
401600~401699	Group 16 (corresponding addresses are Group 1’s addresses + 1500)

Note 1

400100: the group’s cumulative machining count is the accumulated machining count since the gateway started automatically collecting data from this group of devices. See the Bivrost Gateway Manual 6.1.3. Group Machining Count for details.

Note 2

400110-400118: the group’s state times are the durations of each state, within the monitoring period, for all active machines in the group. 400120: the group’s monitored utilization rate is the group’s utilization rate within the monitoring period. See the Bivrost Gateway Manual 6.1.2. Group OEE Data for details.