Examples; Link Axis - Siemens SINUMERIK 840D sl Function Manual

Common system of units changeover via HMI
The following conditions must be fulfilled for all NCUs of the link group in order that a system
of units changeover can be made from the HMI user interface of an NCU of the link group as
well as on all other NCUs of the link group:
● MD10260 $MN_CONVERT_SCALING_SYSTEM = 1
● For all channels:
MD20110 $MC_RESET_MODE_MASK, Bit 0 = 1
● All channels are in the reset state
● No axis is traversed in the JOG or DRF mode or via the PLC
● The function "constant grinding wheel peripheral speed (GWPS)" is not active.
If, on one NCU of the link group, one of the specified conditions is not fulfilled, then the system
of units changeover is not made on any of the NCUs of the link group.
Different systems of units
Different systems of units are possible in spite of an active link group, as long as no cross NCU
interpolation takes place. The system of units settings are made for a specific NCU in the part
program or synchronous action using G commands (G70, G71, G700, G710).
References
Function Manual, Basic Functions; Velocities, Setpoint-Actual Value Systems, Closed-Loop
Control (G2)
3.3

Examples

3.3.1

Link axis

Parameter example for two NCUs each with a link axis
NCU1
Machine data
General link data:
$MN_NCU_LINKNO = 1
$MN_MM_NCU_LINK_MASK = 1
$MN_MM_SERVO_FIFO_SIZE = 3
$MN_MM_LINK_NUM_OF_MODULES = 2
Logical machine axis image (LAI):
$MN_AXCONF_LOGIC_MACHAX_TAB[0] = "AX1"
$MN_AXCONF_LOGIC_MACHAX_TAB[1] = "AX2"
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
B3: Distributed systems - 840D sl only
Note
Master NCU
Set NCU-link active
Size of the data buffer between interpolation and position con‐
trol
Number of link modules
Local machine axis
Local machine axis
3.3 Examples
125