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GWY-01-DNT-01 MANUAL – REV. 02 CHAPTER 5:

DEVICENET INTERFACE

PAGE 55 OF 67

3. Following execution of the command, the Gateway writes its response to the

Input Controller Tag, starting with the 2-byte Produce Data Size, at

Local:2:I.Data [2] and the actual data beginning at Local:2:I.Data [3]. It then

increments the counter value at Local:2:I.Data [1]. This alerts the PLC to the

new data available (the Gateway generated response, in this case).

4. After processing the response information, the PLC copies the counter from

Local:2:I.Data [1] to Local:2:O.Data [0], which signals to the Gateway that the

PLC has retrieved the response data.

OUTPUT CONTROLLER TAG

CONTROLLER TAG

LOCATION AND DATA

DESCRIPTION

Local:2:O.Data [0]

(4) The PLC copies the value at 2:I:Data[1] here to

acknowledge receipt of the response

Local:2:O.Data [1] (1) The PLC increments this counter value after copying

a command in Consume Data

Local:2:O.Data [2]

Consume Data Size

Local:2:O.Data [3]

First WORD of Consume Data (Command from PLC)

Local:2:O.Data [xxx]

xxx WORD of Consume Data

INPUT CONTROLLER TAG

CONTROLLER TAG

LOCATION AND DATA

DESCRIPTION

Local:2:I.Data [0] (2) The value at 2:O:Data[1] is copied here by the

Gateway to acknowledge receipt of a command

Local:2:I.Data [1]

(3) The Gateway increments this counter to signal that a

response is available

Local:2:I.Data [2]

Produce Data Size

Local:2:I.Data [3]

First WORD of Produce Data (Response from Gateway)

Local:2:I.Data [xxx]

xxx WORD of Produce Data

NOTE: A ladder logic example illustrating the implementation of this handshaking

strategy can be downloaded from the technical support area of the EMS website.

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