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1-2
Section
Basic PC Operation and I/O Processes
18
Note
DM 6602 itself can still be changed after the program memory has been write-
protected by setting bits 04 to 07 of DM 6602 to 1.
1-2-4 RS-232C Port Servicing Time (CPM2A/CPM2C/SRM1(-V2) Only)
The following settings are used to determine the percentage of the cycle time
devoted to servicing the RS-232C port.
15
0
Bit
Servicing time setting enable
00: Disabled (5% used)
01: Enabled (setting in bits 00 to 07 used)
Servicing time
(%, valid with bits 08 to 15 are 01)
00 to 99 (BCD, two digits)
Default:
5% of cycle time
DM6616
Example:
If DM 6616 is set to 0110, the RS-232C port will be serviced for 10% of
the cycle time.
The servicing time will be 0.34 ms minimum.
The entire servicing time will not be used unless processing requests exist.
1-2-5 Peripheral Port Servicing Time
The following settings are used to determine the percentage of the cycle time
devoted to servicing the peripheral port.
15
0
Bit
Servicing time setting enable
00: Disabled (5% used)
01: Enabled (setting in bits 00 to 07 used)
Servicing time
(%, valid with bits 08 to 15 are 01)
00 to 99 (BCD, two digits)
Default:
5% of cycle time
DM6617
Example:
If DM 6617 is set to 0115, the peripheral port will be serviced for 15%
of the cycle time.
The servicing time will be 0.34 ms minimum.
The entire servicing time will not be used unless processing requests exist.
1-2-6 Cycle Monitor Time
15
0
DM6618
Bit
Cycle Monitor Time Enable and Units
00: Setting disabled (time fixed at 120 ms)
01: Setting in 00 to 07 enabled; units:10 ms
02: Setting in 00 to 07 enabled; units:100 ms
03: Setting in 00 to 07 enabled; units:1 s
Cycle monitor time setting
(When bits 08 to 15 are not 00)
00 to 99 (2 digits BCD; units set in bits 08 to 15.)
Default:
120 ms.