Yaskawa YASNAC PC NC PLC Programming Manual - Manual (Page 23)

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YASNAC PCNC PLC Programming Manual Chapter 4: Sequence Control Method
4.3 Sequence Program Memory Capacity and Memory Configuration
The PCNC program memory of this PLC can be divided into the areas indicated below.
Fig. 4.6 PCNC Program Memory
Generally, relay instructions occupy 4 to 16 bytes and other instruction 1 to 39 bytes.
Assuming that one instruction occupies an average of 16 bytes, 384K byte memory area
is equivalent to 24K steps (384K/16 = 24K).