Omron CS1W-DRM21, CJ1W-DRM21 More than One Master in Network, Minimum I/O Response Time

TPC:

TRF:

TRT-IN:

TIN:

TOUT:

Remote I/O Communications Characteristics Section 8-1

Minimum I/O Response Time

The minimum I/O response time occurs when the Slave’s I/O refreshing is executed just after the input signal is received by the DeviceNet Unit and the output signal is output at the beginning of the next I/O refresh cycle.

PC	Instruction
	execution

Master Unit processing

Input

Output

(TPC+TRF)

The Input Slave’s ON (OFF) delay

The Output Slave’s ON (OFF) delay

Input Slave’s communications time/Slave (See page 191.)

TRT-OUT: Output Slave’s communications time/Slave (See page 191.)

The PC’s cycle time

The PC’s DeviceNet Unit refresh time (See page 192.)

The minimum I/O response time (TMIN) is the total of the following terms:

TMIN = TIN + TRT-IN + TPC + TRF + TRT-OUT + TOUT

Note 1. Refer to the CompoBus/D (DeviceNet) Slaves Operation Manual (W347) for details on the Input and Output Slaves’ delay times.

2.Refer to Refresh Time on page 192 and to the PC’s Operation Manual for details on the PC’s cycle time.

8-1-3 More than One Master in Network

The following equation shows the remote I/O communications cycle time (TRM) when there is more than one master in the network. An example for two masters is used.

First, the network is divided into two groups: Master A and the slaves in remote I/O communications with it and master B and the slaves in remote I/O communications with it.

		Group A				Group B
		Master A				Master B
Slave A		Slave B	Slave C	Slave D		Slave E	Slave F
	Slaves in remote I/O commu-				Slaves in remote I/O commu-
	nications with Master A				nications with Master B

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