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CS1/CJ1W-PRM21 PROFIBUS Master DTM
Item
Description
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
Slot Time
The maximum time a Master Unit must wait for a response to a request message.
Min. Station Delay
The minimum allowed time for a slave device before it will generate a response to
of Responders
a request message.
Max. Station Delay
The maximum allowed time for a slave device to generate a response to a
of Responders
request message.
Quiet Time
The time a transmitting device must wait after the end of a message frame, before
enabling its receiver.
Setup Time
The time between an event and the necessary reaction.
Min. Slave Interval 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.
Target Rotation
The anticipated time for one token cycle, including allowances for high and low
Time
priority transactions, errors and GAP maintenance. Do not change the value
below the calculated value, to avoid bus communication interruptions.
Max Retry Limit
Maximum number of request transmission retries by this master if a device does
not reply to a request.
Highest Station
The HSA defines the Highest Station Address of Master devices on the network,
Address
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.
GAP Update
The GAP update factor defines the amount of updates of the active devices (i.e.
Factor
Master devices) list times during one token rotation cycle.
To update the list, the Master device will transmit FDL_Status_request messages
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.
Poll Timeout
The maximum time interval that this master device may need for the execution of
a master-master function.
Data Control Time
The cycle time in which the master updates its Data Transfer List, in which it
keeps an overview of all slave states. Data Control Time is based on the
Watchdog time T
Watchdog Control
The Watchdog Control Time defines the time for a slave device to set its outputs
to a fail-safe state, if during that time no communication between the Master
device and that slave device was detected. The Watchdog is automatically set for
all configured slaves, based on the value of T
34
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 pa-
rameters will be optimized to the new baud rate.
: Data Control Time = 7*T
WD
.
WD
.
TR
Section 2-3
Unit
Editable
by User
--
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
ms
No
ms
Yes
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