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DP-V1 services supported by GW-7553-B / GW-7553-M are Read、Write and
Data Transport service, Alarm_Ack didn‟t supported. List shown below is the
Slot-Index mapping table.
Table 13 Slot-Index mapping table
Slot
1
2~32
33~255
Slot 1 is used for the system setting module. Because the user must add "System
setting module" at the first module before the other modules, else the GW-7553-B
/ GW-7553-M will send the diagnostic messages to PROFIBUS Master and the
system will be abnormal.
Slot 2~32 is used for Modbus modules. Index mapped input/output channel from
corresponding module. If a digital module(DI/DO module), one index is only one
bit. If an analog module(AI/AO module), one index is one word.
Slot 33~255 is not supported by GW-7553-B / GW-7553-M. Because the
maximum number of I/O modules is 32.
Note：
The data block fixed by DPV1 write acyclic service will be overwritten by DPV0
cyclic service. We provide an option in "slot 1、index 0、length 1" to change the
priority of DPV1 write acyclic service . The Default value is 0. To achieve the
higher priority of DPV1 write acyclic service , the value has to be set to "1".
Example 1:
If user setup 3 modules in GW-7553-B / GW-7553-M, system setting module、2
GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 30
Modbus Type
N/A
RDI
RDO
WDO
RAI
RAO
WAO
N/A
Index
0
NO. of relay/Coil
NO. of Words
N/A
Length
1
1
2
N/A
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