Switching From Duplex To Simplex Operation; Example Of Error Detection Program - Omron SYSMAC CVM1 Series Operation Manual

Cycle Time

6-2-4 Example of Error Detection Program

1, 2, 3...
6-2-5 Operations Significantly Increasing Cycle Time
Operation Effect on cycle time
Instruction trace Cycle time increased by a
factor of 3 to 5 times.
Memory Card Duplex initialization time
1
operations will be increased.
422
To switch from simplex operation back to duplex operation, eliminate the "cause
for switching" described in the table above, set the DPL Unit's Mode Switch to
"DPL," and press the Initialize Button.
Note The cycle time will be shortened when operation is switched from duplex to sim-
plex operation because the time required to synchronize the active and standby
CPUs is eliminated. That difference will be substantial when instructions that
have much longer instruction execution times in duplex mode (READ(190),
WRIT(191), SEND(192), RECV(193), CMND(194), and IORF(184)) have been
used. Be sure to check system operation in simplex and duplex modes in
advance.
Use either of the program sections shown below to detect a switch from duplex
operation to simplex operation.
1. Use Auxiliary Area bits A39409 to A39411 to indicate the status of the other
CPU Unit during duplex mode operation:
A39409
A39410
A39411
A39409: ON when the other CPU Unit can be mounted or dismounted.
A39410: ON when a CPU error is generated at the other CPU Unit.
A39411: ON when a memory error is generated at the other CPU Unit.
2. Use G00008 and A39115:
G00008 A39115
G00008: SPL/DPL mode setting output
OFF in simplex mode
ON in duplex mode
A39115: ON during duplex initializing processing
The operations described below can significantly affect the cycle time when per-
formed from SSS.
The cycle time will change during an instruction trace and high-speed
input signals might not be detected.
Set the maximum cycle time in the PC Setup at least 5 times higher
than its usual value.
High-speed input signals might not be detected.
Note 1. Memory Card operations include: transfers from the Memory Card to the
PC, online editing, transferring customization information from the comput-
er to the PC, making Communications Unit settings, transferring routing
tables, and transferring data link tables from the computer to the PC.
2. In the CVM1D, PC operation is stopped for the times shown in the following
table but there is no effect on cycle time (i.e., those times are not added to
the cycle time).
Section 6-2
Error output
Error output
Precautions