
4. FUNCTIONS
MELSEC-A
4-8
(6)
Watchdog timer error end (X0D)
(a)
This turns on when a Watchdog timer error occurs.
(b)
This will not turn off until the module is reset or its power supply is turned off and on.
(7)
Operation mode signal (X10)
Indicates whether the current operation mode is the parameter setting mode or not.
ON: Parameter setting mode
OFF: Normal service mode/extended service mode
(8)
Operation mode change request signal (Y11), operation mode change completion signal
(X11)
Used to change the operation mode without resetting the CPU module.
This function is valid only when a start is made with the mode setting switch in the 0, 1 or E
position.
(a)
Operation mode change request signal (Y11)
OFF ¨ON: Requests the operation mode to be switched to the one specified in the
operation mode change request area (address 2255/8CFh) of the buffer memory.
ON ¨OFF: Turns off X11.
(b)
Operation mode change completion signal (X11)
Turns on when the result is stored into the operation mode change result area (address
2256/8D0h) of the buffer memory. This signal also turns on on normal or abnormal
completion of an operation mode change.
This signal turns off when Y11 turns from ON to OFF.
(9)
Communication READY signal (X1B)
(a)
This is turned on when the station enters the exchange start possible state after the
AJ71PB92D/A1SJ71PB92D has started up and the module READY signal (X1D) has turned
on. (Only during the normal transmission mode.)
(b)
This turns off when a exchange continuation impossible error occurs.
(c)
The exchange start request signal (Y00) is used as an interlock when turned on by the
sequence program.
(10) Module READY signal (X1D)
(a)
This is turned on when the AJ71PB92D/A1SJ71PB92D is started up.
Therefore, it is turned on regardless of the operation mode.
(b)
This is turned of when the AJ71PB92D/A1SJ71PB92D goes down.
(11) Communication trouble area type selection (Y03)
(a)
This is used to select the communication trouble area type (ring type or fixed type).
(b)
This is turned off when ring type is selected and on when fixed type is selected.
(c)
This signal becomes valid when the exchange start or communication trouble area clear
request (Y02) is on.
Communication trouble area
type selection (Y03)
Fixed type
selection
Ring type selection
Initial type
(Becomes valid)
Exchange start or communication
trouble area clear request (Y02) on
(12) Restart request signal (Y0D)
(a)
When the AJ71PB92D/A1SJ71PB92D goes down for some reason (when the FAULT LED
turns on and X1D is off) then turning Y0D from off to on to off again will make it possible to
restart the AJ71PB92D/A1SJ71PB92D.
(b)
The same state will be entered if after start up the power supply is turned off and then on
again.