Omron CJ Series User Manual

A-9
Appendices
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
A-2 Bus Parameters
App
Item Description Unit Editable by User
Baud rate Defines the transmission rate on the PROFIBUS DP Network. The following
baud rate values are defined by the PROFIBUS DP standard:
• 9.6 kBits/s
• 19.2 kBits/s
• 45.45 kBits/s
• 93.75 kBits/s
• 187.5 kBits/s
• 500 kBits/s
• 1500 kBits/s (default value)
• 3000 kBits/s
• 6000 kBits/s
• 12000 kBits/s
-- Yes
Optimize 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.
-- Yes
Slot Time The maximum time a Master Unit must wait for a response to a request
message.
t
BIT
Yes
Min. Station
Delay of
Responders
The minimum allowed time for a slave device before it will generate a
response to a request message.
t
BIT
Yes
Max. Station
Delay of
Responders
The maximum allowed time for a slave device to generate a response to a
request message.
t
BIT
Yes
Quiet Time The time a transmitting device must wait after the end of a message frame,
before enabling its receiver.
t
BIT
No
Setup Time The time between an event and the necessary reaction. t
BIT
No
Min. Slave Inter-
val
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.
t
BIT
Yes
Calculated Minimum Slave Interval in milliseconds. ms No
Target Rotation
Time
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.
t
BIT
Yes
Max Retry Limit Maximum number of request transmission retries by this master if a device
does not reply to a request.
-- Yes
Highest Station
Address
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.
-- Yes
GAP Update
Factor
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.
-- No

Omron CJ Series Specifications

General

Brand	Omron
Model	CJ Series
Category	Controller
Language	English