Bus Parameter Settings - Mitsubishi Electric FX5-DP-M User Manual

Bus Parameter Settings

Sets the bus parameters of the PROFIBUS-DP network.
[Master Settings]  [Bus Parameters] button
Normally, use the default bus parameters.
To change the bus parameters, knowledge about the PROFIBUS-DP standards is required.
Item Description
Slot Time (T_sl) Sets the slot time (ms) (the maximum time for waiting responses). (Unit: TBit)
When the time set for this item is exceeded, an error is resulted.
min T_sdr Sets the minimum response time (ms) of the DP-Slave. (Unit: TBit)
max T_sdr Sets the maximum response time (ms) of the DP-Slave. (Unit: TBit)
Quiet Time (T_qui) Sets the time required for switching the send direction of the repeater. (Unit:
*1
TBit)
Set this item to 0 when the repeater is not used.
Setup Time (T_set) Sets the setup time. (Unit: TBit)
Target Rot. Time (T_tr) Sets the target token rotation time. (Unit: TBit)
Sets automatically the time when checked "Use 'Min. slave interval' for 'Target
Token Rotation Time (T_tr)'" in the "Master Settings" window (default setting).
When the box is unchecked, set the time manually. ( Page 83 Master
Settings)
GAP factor Sets the constant for controlling the GAP update time (T_gud).
HSA Sets the maximum FDL address of DP-Slaves in the line.
Max retry limit Sets the maximum number of retries for each send data.
*1 TBit is a unit in which 1 indicates the time it takes to send one bit of data. When a TBit value is input for each item, it is automatically
converted to ms and the converted value is displayed by "ms" on the right side. For the conversion method, refer to the following.
Page 164 Bus cycle time
*2 For the "Min. slave interval" setting, refer to the following.
Page 83 Master Settings
Precautions
The max T_sdr, Quiet Time (T_qui) and Setup Time (T_set) settings in the bus parameters must match the maximum values
of devices connected to the PROFIBUS-DP network, including the DP-Master. The default values are as follows.
Item Transmission speed
9.6kbps, 19.2kbps,
93.75kbps, 187.5kbps
max T_sdr 60
Quiet Time (T_qui) 0
Setup Time (T_set) 1
*1
*1
*1
*1
500kbps 1.5Mbps
100 150
0 0
1 1
Setting range
*1
38 to 16383
(Default: 300)
11 to 1022
(Default: 11)
37 to 1023
(Default: 150)
0 to 127
(Default: 0)
1 to 255
(Default: 1)
256 to 16777215
(Default: The "Min. slave interval" value of TBit)
1 to 100
(Default: 10)
2 to 126
(Default: 126)
1 to 7
(Default: 1)
3Mbps 6Mbps
250 450
3 6
4 8
8 PROFIBUS Configuration Tool
8.3 "PROFIBUS Network" window
8
*2
12Mbps
800
9
16
85