User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
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Configuration - Memory
Each RTU has battery backed RAM (SRAM) that is used to store information about that RTU. Some memory
is reserved by the RTU for storing module data, local registers, configuration parameters and other
information used by the operating system. The remaining memory is configurable and is used to store event
logs, ladder logic, network data, phone numbers, images and firmware drivers. The memory available for
user configuration can be checked by selecting the Check memory usage button or by referring to the table
below.
CPU
Reserved
User
Total
PC-1* / CP-1 64K 192K 256K
CP-10/11 576K 448K 1024K
CP-21 680K 1344K 2048K
LP-1/2/3 128K 384K 512K
* Early revision PC-1 modules had a total of 128K SRAM.
Memory space is automatically allocated for telephone numbers (if configured) and the ladder source file (if
stored in the RTU) when the RTU configuration is downloaded. The default Memory configuration window is
shown below.
Figure: Default RTU Memory Configuration Window
Event Logs: Each event log is stored using 12 bytes. The maximum number of event logs the RTU can
store is [Event Logs Size (Kb)] x 1024 / 12 bytes. Eg if 32 Kb is allocated for event logs, maximum number of
event logs = 32 x 1024 / 12 = 2730. Note: a CP-21 can store a maximum of 65535 event logs. An LP-1/2/3
can store an approximate maximum of 300,000 event logs when using expanded memory.
Compiled Logic: the amount of memory to use for the compiled ladder logic file (FILENAME.LLO). The size
of the compiled ladder logic is displayed when the logic is compiled. 32 Kb is enough memory for most
applications.