
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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Basic procedure for external data output
External data is output using the basic procedure below.
(1) The PMC sets the address signals EIA0 to EIA7 for identifying the type of data. Depending on the type
of data, the PMC sets the tool post specification signal EIHEAD to specify whether the data is for the first
tool post or the second tool post. The data output request signal ERDRQ must always be high. Some of
the data signals EID0 to EID47 must be set, depending on the data.
(2) The PMC then drives the strobe signal EISTB high.
(3) When EISTB goes high, the control unit reads the address signals, data signals, tool post specification
signal, and data output request signal.
(4) After all the signals are read, the control unit drives the read end signal EIREND high.
(5) When EIREND goes high, the PMC drives the strobe signal EISTB low.
(6) When the strobe signal EISTB goes low, the control unit drives the read end signal EIREND low. (Steps
(1) through (6) are basically the same as for external data input, except that ERDRQ is high for external
data output.)
(7) The control unit sets the address signals EOA0 to EOA7 for the requested data, the data signals EOD0
to EOD47, and the tool post specification signal EOHEAD when a request for external data output is con-
firmed (that is, when the data output request signal is determined to be high) in step (3). For data common
to the two tool posts, the control unit drives EOHEAD low.
(8) The control unit then drives the output data strobe signal EOSTB high.
(9) When the strobe signal EOSTB goes high, the PMC must read the address signals and data signals.
(10)After all the signals are read, the PMC drives the read end signal EOREND high.
(11)When EOREND goes high, the control unit drives the strobe signal EOSTB low to report the reception of
the EOREND signal.
(12)When the strobe signal EOSTB goes low, the PMC drives the read end signal EOREND low.
(13)The read end signal EOREND goes low, completing the external data output procedure.