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Appendix Programming Information
Not all system registers are available for all PLC types. Please see the system register tables for a list of system
registers for each PLC type.
Memory size
Set the size of the memory area for the user program.
Hold on/off
Use these system registers to specify the hold area start addresses for relays and registers. Hold areas are not
cleared to 0 when the PLC is switched to PROG mode or when the power is turned off.
The memory area for timer relays and counter relays is partitioned using system register no. 5. Specify the start
address for the counter relays.
Act on Error
Set the operation mode to be chosen after errors such as an operation error, a battery error, or an I/O
verification error.
Time-Out
Set the waiting time before an error is output. You can also specify a constant scan time.
MEWNET-F
Set the PLC start mode and timeout when MEWNET-F slave stations are connected.
PLC Link
These settings are for using link relays and link registers in MEWNET-W0 PLC link communication. Note that
PLC Link is not the default setting.
PROFIBUS/MEWNET-H
Set the data size to be processed during one scan.
High-Speed Counter, Pulse-Catch Input, Interrupt Input
When using the high-speed counter function, pulse catch function or interrupt function, set the operation mode
and the input number to be used for the function.
Time Constants
Set a time constant for the CPU inputs. These time constants can be useful to negate the effects of noise or
bouncing, e.g. for a switching device.
TOOL Port, COM Port
Set these registers when the TOOL port and COM ports 1 and 2 ports are to be used for MEWTOCOL-COM
Master/Slave connections, program controlled communication, PLC link, and modem communication. Note that
the default setting is MEWTOCOL-COM Master/Slave.
40.8.2 System registers for FP-X
Memory size
No.
Name
Sequence program area size
0
Depending on PLC type (12k, 16k, or 32k type)
1)
1274
Default
Values
Fixed
12/16/32 kwords
1)
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