
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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The timing chart for the procedure above is shown below.
Address signal EIA0 to 7
Data signal EID0 to 47
Tool post specification
signal (15-TT) EIHEAD
DATA output
request signal ERDRQ
Strobe signal EISTB
Data read (NC)
Read end signal EIREND
(1) (2) (3) (4) (5) (6)
(7) (8) (9) (10) (11) (12) (13) (14) (15)
Data set (NC)
Address signal EOA0 to 7
Data signal EOD0 to 47
Tool post specification
signal (15-TT) EOHEAD
Strobe signal EOSTB
Data read (PMC)
Read end signal EOREND
External data output does not necessarily occur immediately after external data input for making an external
data output request. If it takes a long time for the control unit to prepare output data, external data output may
be delayed. In such a case, before the external data output is completed, no additional external data input op-
erations are accepted; they are forced to wait. Even if EISTB goes high, the control unit does not read data
until the current external data output operation is completed; in this case, the alarm O0T124 is raised.
External data that can be input/output
(i) Program number
[Input] A program to be executed in the memory command mode is searched for when its program
number is specified.
A program number from 1 to 9999 can be specified in binary.
[Output] The program number of the main program currently executed is output.
(ii) Sequence number
[Input] A block to be executed in the memory command mode is searched for when its sequence
number is specified.
A sequence number from 1 to 9999 can be specified in binary.
[Output] The program number of the block currently executed is output.