GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 39
Error
Position is not correct!(0x3E)
EEPROM Error
Read safe value error.(0xFB)
Data Error
Profibus lose input data.(0x3C)
Lose Profibus output data.(0x3F)
* These error messages are not supported when the GW-7552-B / GW-7552-M act
as a Modbus slave.
PS:
Data Error
：
a. GW-7552-B / GW-7552-M acts as a Modbus master
If the polling speed between the GW-7552-B / GW-7552-M device and the
Modbus slave is faster than the data exchange rate between Profibus master and
the GW-7552-B / GW-7552-M then the Profibus master will not get all the data
from the Modbus slave and therefore a diagnostic message (“Profibus lose input
data”) will be send by the GW-7552-B / GW-7552-M to the Profibus master
b. GW-7552-B / GW-7552-M acts as a Modbus slave
If the GW-7552-B / GW-7552-M receives more telegram from the Modbus
master than it transmits to the Profibus master then a diagnostic message
(“Profibus lose input data”) will be send by the GW-7552-B / GW-7552-M to
the Profibus master.
c. When the GW-7552-B / GW-7552-M receives a “data output command”
(output byte 0) from system setting module, and this command didn‟t increased
in order (ex: 0->1, 1->2,…, 255->0), the GW-7552-B / GW-7552-M will think
that it lose some output data of the Profibus master and a diagnostic message
(“Lose Profibus output data”) will be send by the GW-7552-B / GW-7552-M to
the Profibus master.
4.6 I/O data exchange
The I/O data exchange is decided by Modbus type of the GW-7552-B / GW-7552-
M (please refer section 4.3 The Configuration of the common parameters)
between Profibus master device and the GW-7552-B / GW-7552-M. Output data
area of Profibus master device is mapped into DO/AO memory of the GW-7552-
B / GW-7552-M and input data area of Profibus master device is mapped into
DI/AI memory of the GW-7552-B / GW-7552-M, when Modbus type is master.
In the other way, Output data area of Profibus master device is mapped into DI/AI
memory of GW-7552-B / GW-7552-M and input data area of Profibus master
device is mapped into DO/AO memory of GW-7552-B / GW-7552-M, when