Mitsubishi Electric MELSEC-Q Series Programming Manual page 28

*1 For the timer, retentive timer, and counter, contact/coil values are stored in bit devices, and current values are stored in word devices.
*2 The number of points that can be actually used varies depending on the intelligent function module. For the points in the buffer memory,
refer to the manual for the intelligent function module used.
*3 The value can be changed in the Device setting of the PLC parameter dialog box. (Except for input, output, step relay, link special relay,
and link special register). Refer to the User's Manual (Function Explanation, Program Fundamentals) of the CPU module used.
*4 Available only in a multiple CPU system configuration.
3 SPECIFICATIONS
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3.2 Device List