Mitsubishi Q2ACPU User Manual

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9. MAINTENANCE FUNCTION
(4) Procedure when using special relays/special registers
(a) Use the following procedure when using special relays/special registers:
(b) Setting data in SD251 and turning ON/OFF SM251 can be done either by using
the sequence program or a peripheral device.
REMARK
1) Set the first two digits of the three-digit expression for the head I/O number of
the I/O module to be replaced in SD251 (replaced I/O module head I/O No.
storage register).
Example:
Head I/O No. = 070 set number is H07
Head I/O No. = 170 set number is H17
2) Turn ON SM251 (I/O replacement flag).
3) Confirm that SM252 (replacement enabled flag) comes ON first, and replace
the designated I/O module.
4) Turn OFF SM251. (SM252 is turned OFF automatically.)
(a) Method when Using a Sequence Program (b) Method when Using GPP function
A sequence program of the type shown below can be used to
replace a designated I/O module while the QnACPU is in the
"RUN" status.
* The sequence program shown above can be written from GPP
function in the RUN status.
(1) Turn ON the input condition, and set the number of the I/O
module to be replaced in SD251 and turn ON SM251.
(2) Confirm that output Y** has come ON first, and replace the
designated I/O module.
(3) Turn OFF the input condition, and turn OFF SM251.
(This starts operation of the module after replacement.)
A designated I/O module can be replaced in the GPP function test
mode.
Any of RUN, STOP, or PAUSE status is possible for the QnACPU.
(1) Connect a peripheral device capable of GPP functions to the
QnACPU.
(2) In the test mode, set the first two digits of the head I/O number
of the module to be replaced in SD251.
(3) In the test mode, set (turn ON) SM251.
(4) In the monitor mode, confirm that SM252 has come ON , and
replace the designated I/O module.
(5) In the test mode, reset (turn OFF) SM251.
(This starts operation of the module after replacement.)
1) While SM251 is ON, the QnACPU does not perform the module verify and the
fuse blown check. After replacing the module, turn OFF SM251 immediately.
2) "100
H" is stored in SD251 as the default value.
Procedure
Procedure

Mitsubishi Q2ACPU Specifications

General

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English