Programming IDEC SmartRelay
IDEC SmartRelay Manual 102
3.7 Memory space and circuit dimensions
The size of a circuit program in IDEC SmartRelay is limited 
by the memory space (memory used by the blocks).
Memory areas
• Program memory: 
IDEC SmartRelay allows only a limited number of blocks 
in your circuit program.
 
The second limitation is based on the maximum number 
of bytes a circuit program may contain. The total number 
of bytes used can be determined by adding up the num
-
ber of bytes used for the relevant function blocks. 
• Retentive memory (Rem): 
In this area, IDEC SmartRelay stores process variables 
which need to be retentive, e.g. the Operating hours 
counter value. Blocks with optional retentivity use this 
memory area only if this function is actually enabled.
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