Omron CJ Series Operation Manual page 98

3 Configuration Software
Item
Baud rate
Optimize
Slot Time
Min. Station
Delay of
Responders
Max. Station
Delay of
Responders
Quiet Time
Setup Time
Min. Slave Inter-
val
Target Rotation
Time
Max Retry Limit
Highest Station
Address
GAP Update
Factor
Poll Timeout
3-20
Description
Defines the transmission rate on the PROFIBUS DP Network. The following
baud rate values are defined by the PROFIBUS DP standard:
• 9.6 Kbps
• 19.2 Kbps
• 45.45 Kbps
• 93.75 Kbps
• 187.5 Kbps
• 500 Kbps
• 1.5 Mbps(default value)
• 3.0 Mbps
• 6.0 Mbps
• 12 Mbps
The Optimize setting defines whether 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 optimized to the new baud rate.
The maximum time a Master Unit must wait for a response to a request
message.
The minimum allowed time for a slave device before it will generate a
response to a request message.
The maximum allowed time for a slave device to generate a response to a
request message.
The time a transmitting device must wait after the end of a message frame,
before enabling its receiver.
The time between an event and the necessary reaction.
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.
The anticipated time for one token cycle, including allowances for high and
low priority transactions, errors and GAP maintenance. Do not change 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.
The HSA defines the Highest Station Address of Master devices on the net-
work, of which the Master device will request the FDL status, when updating
the active device list (See GAP Update Factor).
If new slaves are added to the network, this field shows the highest device
address. The Master will periodically check whether new active devices
have been added between its own address and the Highest Station Address.
If any devices are detected, GAP is updated.
Permissible values are in the range of 0 to 126.
The GAP update factor defines the amount of updates of the active devices
(i.e. Master devices) list times during one token rotation cycle.
To update the list, the Master device will transmit FDL_Status_request mes-
sages to ascending device addresses until it finds a next Master device, or
until it reaches the Highest Station Address (See HSA above).
The GAP Update Factor is fixed to 1.
The maximum time interval that this master device may need for the execu-
tion of a master-master function.
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Unit Editable by User
-- Yes
-- Yes
t Yes
BIT
t Yes
BIT
t Yes
BIT
t No
BIT
t No
BIT
t Yes
BIT
ms No
t Yes
BIT
-- Yes
-- Yes
-- No
ms No