HEIDENHAIN TNC 335 Technical Manual - Manual (Page 400)

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TNC 360 2 Program Creation 7-21
Input range: 0 to 65 535 [PLC cycles]
2.5 Edge evaluation of the PLC inputs
The edge evaluation for the PLC inputs can be activated by marker M2497. Edge evaluation means
that if the signal at the PLC input changes, a certain marker will be set for the duration of a PLC run.
If marker M2497 is set, the following markers will be set if the signals change at the PLC inputs.
Marker for rising edges at the PLC inputs:
Marker PLC inputs
M1500 to M1531 I0 to I31
M1564 to M1626 I64 to I126 (PL 400) or I127 (PL410)
M1628 to M1651 I128 to I151
Marker for falling edges at the PLC inputs:
Marker PLC inputs
M1700 to M1731 I0 to I31
M1764 to M1826 I64 to I126 (PL 400) or I127 (PL410)
M1828 to M1851 I128 to I151
Marker Function Set Reset
M2497 Activate the edge evaluation for PLC inputs
Rising-edge marker M1500 to M1651
Falling-edge marker M1700 to M1851 PLC PLC
2.6 EPROM creation
Machine parameter MP4010 selects whether the PLC program is run from the RAM area of the
control or the EPROM area.
During the creation and test of the PLC program the control should operate from the RAM area.
HEIDENHAIN recommends that an EPROM is created for the PLC program before delivering the
machine to the customer (see also Chapter "Introduction").
MP4010 PLC program from RAM or from EPROM
Input: 0 or 1
0 = EPROM operation
1 = RAM operation
A PC and the MEGA PROMMER Software (Version 2.12.or later) are necessary for programming
the PLC EPROMS.
The PLC files from the RAM area in the control can be transferred to the PC via the data interface
(see Chapter "Data interface").The output is initiated from the control in binary code (see Section
"PLC functions").