Omron CJ1W-EIP21 用户手册

Maximum transmission delay =

CPU Bus Unit service cycle (Local node, 1)
+ CPU Bus Unit service processing time (Local node, 1)
+ Send processing (Command)
+ Transmission delay (Command)
+ Receive processing (Command)
+ CPU Bus Unit service cycle (remote node)
+ CPU Bus Unit service processing time (remote node)
+ Send processing (Response)
+ Transmission delay (Response)
+ Receive processing (Response)
+ CPU Bus Unit service cycle (Local node, 2)
+ CPU Bus Unit service processing time (Local node, 2)

The following table shows the service cycle, which depends on the CPU Unit’s
CPU processing mode setting.

CJ2 CPU Units support only Normal Mode.

For details, refer to the CPU Unit’s Operation Manual.

The following table shows the CPU Bus Unit service processing time, which
depends on the CPU Unit’s CPU processing mode setting.

CJ2 CPU Units support only Normal Mode.

Maximum transmission delay

Execution of RECV(099)
in user program

CPU Bus Unit service cycle 
(Local node, 1)

CPU Bus Unit service processing time 
(Local node, 1)

Send processing 
(Command)

Receive processing 
(Command)

Transmission delay 
(Command)

CPU Bus Unit service cycle 
(Local node, 2)

CPU Bus Unit service 
processing time (Local node, 2)

Send processing 
(Response)

Transmission delay 
(Response)

Transmission delay 
(Response)

CPU data set
processing

CPU Bus Unit service processing time
(Remote node)

CPU Bus Unit service cycle 
(Remote node)

Normal Mode (See note.)

One CPU Unit cycle time

Priority peripheral servicing

Parallel processing with syn-
chronous memory access

0.2 ms + peripheral servicing time (1 ms max. for 
peripheral servicing of each Special I/O Unit, CPU 
Bus Unit, peripheral port, RS-232C port, and Inner 
Board)

Parallel processing with asyn-
chronous memory access

Normal Mode (See note.)

Set peripheral servicing time

Default: 4% of CPU Unit cycle time

(10% for CJ2 CPU Units)

Priority peripheral servicing

Parallel processing with syn-
chronous memory access

1 ms max.

Parallel processing with asyn-
chronous memory access