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C200HW-PRM21 PROFIBUS Master DTM
!Caution Changing the calculated Bus Parameters manually is not recommended, and
Item
Description
Profile
Provides pre-selected settings for either a PROFIBUS DP or a PROFIBUS PA
network. The following selections are possible from the drop-down list:
• PROFIBUS DP (Default bit-rate: 1500 kbit/s)
• PROFIBUS PA (Default bit-rate: 93.75 kbit/s)
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
• 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
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.
Station Address
This value defines the device address of the C200HW-PRM21 PROFIBUS
Master unit. Permissible values are in the range of 0 to 125.
An attempt to change the address in to a value which is already occupied will
result in an error message.
Target Rotation
The anticipated time for one token cycle, including allowances for high and low
Time
priority transactions, errors and GAP maintenance.
Token Rotation Time in ms.
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 below).
Permissible values are in the range of 0 to 255.
Max Retry Limit
Maximum number of request transmission retries by this master if a device does
not reply to a request.
50
should only be performed if this is really necessary. Changing the Bus Param-
eters to an invalid combination, may result in Unit malfunctioning and unex-
pected behaviour.
Note The bus parameter calculations as performed by the C200HW-PRM21 DTM
will differ from the calculations performed by the predecessor program
Sycondp, due to updated insights in bus calculation algorithms.
The table below lists the parameters, shown in the Bus Parameter tab.
Section 2-4
Unit
Editable
by User
--
Yes
--
Yes
t
Yes
BIT
t
Yes
BIT
t
Yes
BIT
t
Yes
BIT
t
Yes
BIT
t
Yes
BIT
ms
No
--
Yes
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Yes
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