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Module
Byte
Output
3~130
module
Data output command(byte 0)
●
a. When Modbus type is master
When this byte is changed, Profibus master device will send data of
output module to DO/AO data of GW-7552-B / GW-7552-M and then
GW-7552-B / GW-7552-M will send query message to Modbus slave
device for change data or output state of Modbus slave device.
b. When Modbus type is slave
When this byte is changed, Profibus master device will send data of
output module to DO/AO data of GW-7552-B / GW-7552-M.
PS: When the user use this byte to trigger "data output command", the
user must increase this byte in order (ex: 0->1, 1->2,..., 255->0) or else
the GW-7552-B / GW-7552-M will send a diagnostic message to the
Profibus master (please refer section 4.5 Diagnostic messages).
Control bit(byte 1)
●
DC(bit 0)：When this bit is set (DC=1), diagnostic messages send by the
SM(bit 1)：When this bit is set (SM=1), the GW-7552-B / GW-7552-M
Bit 2~7：The remaining bits have to be set to zero.
Output module select(byte 2)
●
When this byte is „0‟ and the user change data output command(byte 0),
it will trigger all data output command of output modules.
When this byte isn‟t „0‟ and the user change data output command(byte
0), it will trigger single data output command of the output module and
this byte
represent that the user want to trigger data output command of the third
module )
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 41
Bit Position
GW-7552-B / GW-7552-M module will all be cleared.
will enter setup mode. The utility can communicate with the
GW-7552-B / GW-7552-M in this mode.
When this bit is ''0'' (SM=0), the GW-7552-B / GW-7552-M
will enter normal operation mode. The GW-7552-B / GW-
7552-M can communicate with Modbus device in this mode.
represent module address of the output module (ex: "byte 2"=3, it
Description
Output data
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