Omron SYSMAC CS Series Operation Manual page 251

Bus Parameters
The table below defines the bus parameter settings options, shown in the figure. The Unit t
transmission time for one bit at the selected baud rate.
Item
Baud rate
Optimize
Slot Time
Min. Station Delay of
Responders
Max. Station Delay of
Responders
Quiet Time
Setup Time
Min. Slave Interval
Target Rotation Time
Max Retry Limit
230
Symbol Description
-- Defines the transmission rate on the PROFIBUS DP Net-
work. The following baud rate values are defined by the
PROFIBUS DP standard:
• 9.6
• 19.2
• 45.45
• 93.75
• 187.5
• 500
• 1500 (default value)
• 3000
• 6000
• 12000
-- The Optimize setting defines whether or not selected
parameters can be changed by the user.
• By Standard
Forces the user to use the default (optimized) settings.
• By User
Makes selected fields editable.
Note 1. If the By User option is selected and changes
have been made, it is still possible to switch
between Optimize settings, without the changes
being lost.
2. If the By User option is selected and the baud
rate is changed, the parameters will be opti-
mized to the new baud rate.
T The maximum time a Master Unit must wait for a response
SL
to a request message.
min T The minimum allowed time for a slave device before it will
SDR
generate a response to a request message.
max T The maximum allowed time for a slave device to generate a
SDR
response to a request message.
T The time a transmitting device must wait after the end of a
QUI
message frame, before enabling its receiver.
T The time between an event and the necessary reaction.
SET
-- The Minimum Slave Interval defines the poll cycle, i.e. the
minimum time between two consecutive Data_Exchange
Cycles to the same slave device. The Minimum Slave
Interval must be smaller than the Target Rotation Time.
Calculated Minimum Slave Interval in milliseconds.
T The anticipated time for one token cycle, including
TR
allowances for high and low priority transactions, errors
and GAP maintenance. Do not set the value below the
calculated value, to avoid bus communication
interruptions.
-- Maximum number of request transmission retries by this
master if a device does not reply to a request.
Appendix A
is defined as the
BIT
Unit Editable
by User
kBits/s Yes
-- Yes
t Yes
BIT
t Yes
BIT
t Yes
BIT
t No
BIT
t No
BIT
ms Yes
ms No
t Yes
BIT
-- Yes