User`s manual
199
CHAPTER 6 CHANGING THE DATA COMMUNICATIONS MONITORING TIMES
6
6.2 Response Monitoring Time (timer 1) Setting
(2) Changing the response monitoring time (timer 1)
The response monitoring time (timer 1) is registered on the GX Configurator-SC's "Transmission control and
others system setting" screen.
For data communication using the MC protocol, set the response monitoring time so that it is longer than the
message wait time.
*1
*1 The message wait time is designated at the following locations.
• A compatible 1C frame: Designate in a command message
• QnA compatible 2C/3C/4C frame: GX Configurator-SC "MC protocol system setting" screen
When changing the response monitoring time (timer 1) default value (5 s), observe the following precautions.
(1) Data communications using an MC protocol
In any of the following cases make the default value the message wait time described in Page 202, Section 6.4, or longer.
● When designating the monitor conditions with the following functions, set the maximum time matched to system
operation.
• Word units random read ( MELSEC Communication Protocol Reference Manual)
• Device memory monitor ( MELSEC Communication Protocol Reference Manual)
● Access other than (a) above
• When accessing a station connected (including multidrop link) to an external device, set the following value, or
longer.
Response monitoring time >= Maximum number of scans required to process the command used connected station scan
time
• When accessing another station over a network system, set the default value to infinity or the following time, or
longer.
Response monitoring time >= Maximum number of scans required to process the command used communications time
When setting the default value to infinity, check the external device response wait time and initialize the Q series C24
transmission sequence when time-out is generated. ( MELSEC Communication Protocol Reference Manual)
Refer to the MELSEC Communication Protocol Reference Manual for the maximum number of scans and the
communication time required by processing.
(2) Data communications using bidirectional protocol
Set the default value to the following time, or longer.
(Sequence scan time 2) + 100ms