DR. JOHANNES HEIDENHAIN GmbH
D-6225 Traunreut .Tel. (08669) 31-O
Kundendienat
SERVICE MANUAL TWC 151/155
Page 27
Section 2.2.6
Continuation of the Burn-In test initialization
The reminder of the initialization procedure must be described
in conjunction with the flow diagram of figure 9, page 29
1. Beginning with the display
"EXTERNAL UNIT CONNECTED ?"
which refers to the use of an external test computer, the
operator must respond by pressing
ig
2. A check is now automatically carried out, to ensure that the
test program data has not been corrupted in any way. If an
error is detected, the display
"REREAD-IN PROGRAM XXXX
CHECK SUM ERROR"
The lines of dots represent the individual keys in each of
the four keying fields.
The keys must now be pressed once
each, in a defined sequence, in order that the Control can
check that each key is making contact and delivering the
correct code to the keyboard interface.
The keying sequence is as follows:
- top right set of 20 keys
- top left set of 10 keys
- middle left set of 20 keys
- bottom left set of 4 keys (only with TNC 155!)
- bottom right set of 10 keys
In each case, the sequence is from left to right, beginning
with the top row.
For each correct key-push, the respective dot on the VDU
will be replaced with a "*".
If an incorrect code is received, the keyboard test will
start again from the beginning.
will appear on the VDU, and the test program must be reloaded
from the ME unit.
If the keyboard test has previously been carried out (eg
before a power failure), the option of carrying out the
test is not displayed.
In this case, assuming no error
message has been stored from a previous run, the program
jumps into the sequential tests (see page 30). 3. If the keyboard test has not already been carried out (eg.
prior to a mains interruption) the option of carrying out
this test will now be displayed: 4. If the keyboard test has previously been carried out, and
an error message has been stored from an earlier run, this
"BI: SOFTWARE NUMBER XXXXXX XX
error message will be displayed and the program will wait
JUMP OVER KEYBOARD TEST ?"
for an interrupt (see point 7).
The keyboard test can be skipped by pressing the key
ia
5. In the case of a Control designed for use with an external
PLC I/O Board, (TNC 151/155 Q/W) the following text will
appear on the VDU, following a successful keyboard test:
Any other key will cause the test to be carried out, in which
case the following display will appear on the VDU: "0, 1, OR 2 PC-BOARD ?"
. . . . . . . . . . . . . . . . . . ..E This refers to the number of external PIG I/O Boards con-
. . . . . . . . ..E netted to the Control during the test, and must be answered
. . . . . . . . . . . . . . . . . . ..E with the appropriate numeric key;
. . . . E (only with TNC 1551)
. . . . . . . . ..E
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