HEIDENHAIN iTNC 530 HSCI - Two Handwheels on the TNC

1504 HEIDENHAIN Technical Manual iTNC 530 HSCI
Two handwheels
on the TNC
As of software version 60642x-03, two handwheels can be connected and
used alternately in the HSCI system.
One handwheel is connected to X23 of the machine operating panel. It has the
index .0 in the handwheel MPs. The second handwheel must be connected to
X29 of the MC main computer unit. It has the index .4 in the handwheel MPs.
Machine parameters MP7640 (type of handwheel) and MP7650 (counting
direction) were therefore expanded to 5 indices. MP7642 (handwheel name)
was added, as well as MP7646 to MP7649, which—just like MP7645—
contain handwheel-specific parameters for the other handwheels. In future
software versions the number of possible handwheels is planned to be
increased further. The corresponding indices of the mentioned machine
parameters have already been reserved for this purpose. MP7641 for the
handwheel settings is globally effective for all handwheels in the system.
Please note that at present only the handwheel connected to X23 of the last
machine operating panel in the HSCI chain is supported if there is more than
one machine operating panel in the HSCI system. A machine operating panel
at X501 of the MC main computer unit is automatically always the last
machine operating panel in the HSCI system.
As before, the permissive buttons of all handwheels must be evaluated by
suitable external devices. No more than one permissive device may be active
on the machine at any one time. If you are using a control system with
integrated functional safety (FS), FS inputs can be used for the evaluation of
the permissive buttons. As before, the emergency stop buttons of all
handwheels must be evaluated by suitable external devices. All emergency-
stop devices of the machine must function reliably at all times. Under no
circumstances are these devices to be deactivated. If you are using a control
system with integrated functional safety (FS), the emergency-stop inputs (–
ES.A, –ES.B) should be used for the evaluation of the emergency-stop
buttons. Several emergency-stop buttons can be connected in series for this
purpose.
If only handwheels with display (HR 420, HR 520, HR 550) are involved, the
active handwheel is defined solely through the selection key on the
handwheel. If there is exactly one HR 110 panel-mounted handwheel in the
system, it becomes active automatically if control is not assigned to the
display handwheel.
In all other cases, the handwheel must be activated via the PLC program if
more than one handwheel is involved. The active handwheel can be defined
with PLC Module 9036 and the new selection parameters 20 (active
handwheel) and 21 (standard handwheel). Number 70 (active handwheel) and
number 71 (standard handwheel) of the PLC Module 9035 can be used to read
back the currently active handwheel.
The PLC interface for the handwheels will not be expanded. The currently
active handwheel always accesses the markers and double words of the PLC
that have already been used before (e.g. M466x for the HR keys).