Chapter 2 Devices 2.1.2 Basic Structure of I/O Storages 2.1.3 Relation between the PLC Action and the Device Type 2.1.4 Latched Areas in the Device Range 2-3 Device Function Access o f Access o f Modification Forcing the bit bits words by ISPSoft ON/OFF X Input relay OK OK OK OK Y Output relay OK OK OK OK M Auxiliary relay OK - OK NO SM Special auxiliary relay OK - OK NO S stepping relay OK - OK NO T Timer OK OK OK NO C Counter OK OK OK NO HC 32-bit counter OK OK OK NO D Data register OK OK OK NO SR Special data register - OK OK NO L Link register OK OK OK NO E Index register - OK OK NO Device type Non-latched Latched Output relay PLC action area area Power:
OFF→ON Cleared Retained Cleared STOP ↓ RUN The output relay is cleared. Retained Retained Cleared The state of the output relay is retained. Retained Retained Retained STOP The state of the output relay returns to that before the PLC’s stopping. Retained Retained The state of the output relay returns to that before the PLC’s stopping. ↓ RUN The non-latched area is cleared. Cleared Retained Cleared The state of the latched area is retained. Retained Retained Retained RUN→STOP Retained Retained Retained SM204 is ON. Cleared Retained Cleared (All non-latched areas are cleared.) SM205 is ON.
Retained Cleared Retained (All latched areas are cleared.) Default value 0 0 0 Device Function Device range Latched area X Input relay X0~X511 All devices are non-latched. Y Output relay Y0~Y511 All devices are non-latched. M* Auxiliary relay M0~M8191 The default range is M0~M8191. SM Special auxiliary relay SM0~SM2047 Some devices are latched, and can not be changed. Please refer to the function list of SM for more information. S Stepping relay S0~S1023 All devices are non-latched. T* Timer T0~T2047 The default range is T0~T2047. C* Counter C0~C2047 The default range is C0~C2047.