GE P485 - Manual (Page 41)

COMMUNICATION MODEL
P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE 5–5
• Update mode: This parameter is used to specify when the command should be sent
to the slave. The following modes are possible:
– Cyclically: The command is sent to the slave at the time interval specified in the
“Update time” parameter.
– On data change: The command is sent to the slave when the data area connected to
this command changes.
– Single shot: The command is sent to the slave once at start-up.
– Change of state on trigger: The command is sent to the slave when the trigger byte
value is changed.
• Update time (10 ms): This parameter specifies with what frequency this command will
be sent. The unit is milliseconds (ms) and the entered value is multiplied by 10, which
means that the shortest time is 10 ms.
RESPONSE PARAMETERS To gain access to these parameters, select a Response in the Navigation window.
• Trigger byte: This parameter disables and enables the trigger functionality for the
response. If the “trigger byte” is enabled then the P485 will increase the byte at the
“trigger byte address” by one when the P485 receives new data from the Modbus
network. This will notify the Profibus master of updated data.
• Trigger byte address: This parameter is used to specify the address in the internal
memory buffer where the trigger byte is located. Valid settings range from 0x0002 to
0x00F3.