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(c) Tool post specification signal for external data input (EIHEAD (15–TT))
[Classification]
Input signal
[Function] This signal indicates whether data sent with the external data input function is for the first tool
post or the second tool post.
When this signal is low, the data is for the first tool post. When this signal is high, the data
is for the second tool post. When external input data is common to both tool posts, this signal
has no effect.
(d) Strobe signal for external data input (EISTB)
[Classification]
Input signal
[Function] This signal reports that an address and data have been prepared for external data input.
When this signal goes high, the control unit reads the address and data signals sent with the
external data input function.
For the operation and procedure of the control unit when this signal goes high, see “Basic
procedure” described earlier in this section.
(e) Read end signal for external data input (EIREND)
[Classification]
Output signal
[Function] This signal reports that the control unit has read data sent with the external data input function.
For the output conditions and procedure, see “Basic procedure” described earlier in this sec-
tion.
(f) External data output request signal (ERDRQ)
[Classification]
Input signal
[Function] This signal indicates whether external data input is for data input or for an external data output
request.
For the operation and procedure of the control unit when this signal goes high, see “Basic
procedure” described earlier in this section.
(g) Address signals for external data output (EOA0 to EOA7)
[Classification]
Output signals
[Function] These signals indicate the type of data sent with the external data output function. These sig-
nals consist of eight code signals. For the correspondence between the codes and data
types, see Table 2.3.51.
(h) Data signals for external data output (EOD0 to EOD47)
[Classification]
Output signals
[Function] These signals represent data sent with the external data output function. These signals con-
sist of 47 code signals, and the method of using these signals depends on the type of data.
These signals are generally used as binary code signals as follows:
Data value =
ȍ
b
i+0
(2
i
Vi)
where Vi = 0 when EODi is low
Vi = 1 when EODi is high
a, b: Depend on the type of data (0 x a < b x 47).
For detailed information, see Table 2.3.51.
(i) Tool post specification signal for external data output (EOHEAD (15–TT))
[Classification]
Output signal
[Function] This signal indicates whether data sent with the external data output function is for the first
tool post or the second tool post.
When this signal is low, the data is for the first tool post. When this signal is high, the data
is for the second tool post. When external input data is common to both tool posts, this signal
has no effect, but is low when output.