Instructions

Transactions 71
Doc: HMSI-27-314, Rev. 3.10Anybus Communicator EtherNet/IP / Modbus-TCP User Manual
13.3.2 Parameters (Response)
Update mode This parameter is used to specify when the transaction shall be sent to the slave:
• Cyclically
The transaction is issued cyclically at the interval specified in the “Update time”
parameter.
• On data change
The data area is polled for changes at the time interval defined by Update time. A
transaction is issued when a change in data is detected.
• Single shot
The Query is issued once at start up.
• Change of state on trigger
The Query is issued when the trigger byte value has changed. This feature ena-
bles the control system to notify the gateway when to issue a particular Query. To
use this feature correctly, the control system must first update the data area asso-
ciated with the Query/transaction, then increase the trigger byte by one. The loca-
tion of the trigger byte is specified by the “Trigger byte address” parameter. The
trigger byte is checked at the interval specified in the “Update time” parameter.
Update time (10 ms) This parameter specifies how often the transaction will be issued in steps of 10 ms
(relevant only when “Update mode” is set to “Cyclically”, “On data change” or “Change
of state on trigger”).
The entered value is multiplied by 10. An entered value of 5 will result in 50 ms.
Parameter Description
Trigger byte This parameter is used to enable/disable the trigger functionality for the response. If
enabled, the gateway will increase the trigger byte by one when the gateway receives new
data from the sub-network. This can be used to notify the control system of the updated
data.
The location of the trigger byte is specified by the “Trigger byte address” parameter below.
Trigger byte address This parameter specifies the location of the trigger byte in the internal memory buffer.
Valid settings range from 0x000 to 0x1FF and 0x400 to 0xFFF
Parameter Description