Omron SYSMAC CS1D-PD Series Operation Manual page 174

Duplex CPU Units
134
■ °Replacement Method
When performing Duplex with CS1D-CPU65H or CPU67H, refer to 11-3
Replacing a CPU Unit for details on the procedure of replacing with the
CS1D-CPU67HA.
■ Change the Setting
To change the Duplex CPU Compatible Setting, perform Memory All Clear
using the Programming Device and then turn OFF the power supply to the
CPU Unit. Changing the duplicated CPU compatible setting without perform-
ing Memory All Clearr will result in a memory error (Detailed error: Duplex
CPU compatible setting change error).
If all of the following conditions are satisfied, the DPL bus error may occur.
• When duplicating with CS1D-CPU67H and CS1D-CPU67HA (CPU 67H mode)
• When the execution time from the start of instruction execution to the syn-
chronous instruction (*1) or the execution time between synchronous
instructions (*1) is 100 ms or more.
Synchronized instructions
Synchronized instructions
If a DPL bus error occurs because one of the above conditions applies, either
of the countermeasures below can be taken to remedy the problem.
Countermeasure 1: Use a CS1D-CPU67HA for both the active CPU and the
Countermeasure 2: Add a synchronous instruction so that the execution time
*1: Instructions requiring synchronization refer to the following instructions.
• IORF (I/O REFRESH)
• DLNK (CPU BUS UNIT I/O REFRESH)
• IORD/IOWR (INTELLIGENT I/O READ/ WRITE)
• PID (PID CONTROL)
• RXD (RECEIVE)
• FREAD/FWRIT/TWRIT (File memory instructions)
Start of an instruction execution
*
*
If the execution time of this section exceeds
*
100 ms, the DPL bus error may occur.
standby CPU.
from the start of instruction execution until the synchro-
nous instruction, or the execution time between synchro-
nous instructions, is less than 100 ms. Any synchronous
instruction can be used.
Put the added synchronous instruction in the execution
state.
Example: IORF 999 999
(Use an input/output relay area that is unused)
Section 3-1