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Communication protocols
Modbus > Modbus Slave - Parameter
Protocol parameter
Parameter
Slave address
Operating mode
Multiplier character delay
time
FC 01, 05, 15, 02
FC 03, 06, 16, 04
Limits
68
Description
Here the own slave address may be set, which the CP has
to respond to.
n
Range of values: 1 ... 255
Here the operating mode of the driver may be set.
In Normal operation every recognized transmission error
and break will result in error handling, even if the driver is
in idle mode.
In the operating mode Interference suppression transmis-
sion errors and breaks are ignored when the driver is in
idle mode. If the driver leaves the idle mode transmission
error and break will result in error handling.
n
Range of values: Normal operation, Interference sup-
pression
If on e communication partner cannot meet the time
requirements set by the Modbus specifications, you have
the option to increase the character delay time with the
multiplier.
n
Range of values: 1 ... 10
n
In this dialog window the bit oriented function codes FC 01, 05 and 15 may be
assigned to address areas of the CPU.
n
Bit memories, outputs, timer and counter of the CPU may be accessed by means of
this function codes. With timer and counters the reading access is only possible with
function code FC 01.
With FC 02 a Modbus address area is assigned to bit memory and input area of the
n
CPU, which is accessed by reading.
n
The data blocks of the CPU may be accessed (R/W) by the register oriented function
codes FC 03, 06 and 16. Here you can indicate starting from which DB number the
Modbus address starting with 0 is assigned.
n
Up to 128 DB may be accessed in one block. With the register oriented function code
FC 04 data blocks of the CPU may only be accessed by reading. Here a further block
of 128 DBs may be determined.
More details may be found at the appropriate function codes.
n
n
For the writing function codes FC 05, 06, 15 and 16 the access to the corresponding
area must be enabled before.
n
By default the whole output area of the CPU is disabled for write access, this means
each value is 0.
If the master tries to write to an output area of the CPU, which is outside the enabled
n
area, the access is replied by a corresponding error message.
VIPA System 300S
Default value
222
Normal operation
1
HB130 | CP | 341-1CH01 | en | 18-40
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