AH Motion Controller – Operation Manual 5.2.3. Latched Devices Latched areas of each type of device _5 *Note : You can define the range of latched areas for T, C, M and D and set the devices to be non-latched. Note that the range should not exceed the available device range, and only 32768 D devices at most can be non-latched. For example, you can set D50~D32817 or D32768~D65535 to latched area though the default range of latched areas is D0~D32767. Do not disconnect power or CPU module while the power is on. Once the PLC is disconnected from the backplane, the data in the latched area such as devices will be affected.
5-4 Device Function Device range Latched area X Input relay X devices (bit): X0.0~X511.15 X devices (word): X0~X511 All devices are non-latched. Y Output relay Y devices (bit): Y0.0~Y511.15 Y devices (word): Y0~Y511 All devices are non-latched. M* Auxiliary relay M0~M8191 Default: M0~M8191 SM Special auxiliary relay SM: SM0~SM2047 Some devices are latched, and can not be changed. Refer to the table of special auxiliary relays in the appendices for more information. S Stepping relay S0~S2047 All devices are non-latched. T* Timer T0~T2047 Default: T0~T2047. C* Counter C0~C2047 Default: C0~C2047. HC/AC* 32-bit counter HC: HC0~HC63 AC: AC0~ AC55 (AHxxEMC) Default: HC0~HC63.
AC devices are non-latched. D* Data register D device (bit): D0.0~D65535.15 D device (word): D0~D65535 Default: D0~D32767. At most 32768 devices can be latched devices. SR Special data register SR: SR0~SR2047 Some are latched, and can not be changed. Refer to the list of special data registers for more information. L Link register L0~ L65535 All devices are non-latched. E Index register E0~E31 All devices are non-latched.