GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 29
a module. Each data block can be up to 244 bytes. Length is used to indicate the
read/write length. If
t
he information addressing use non-exist slot
、
index or
length, the corresponding error code will be signaled(see
Table 12
、
Figure 26
Error code/Error class
), the reply is sent to the master.
Table 12 Error code/Error class
Error_Class
Meaning
Error_Code
10
application
0 = read error
1 = write error
2 = module failure
3 to 7 = reserved
8 = version conflict
9 = feature not supported
10 to 15 = user specific
11
access
0 = invalid index
1 = write length error
2 = invalid slot
3 = type conflict
4 = invalid area
5 = state conflict
6 = access denied
7 = invalid range
8 = invalid parameter
9 = invalid type
10 to 15 = user specific
12
resource
0 = read constrain conflict
1 = write constrain conflict
2 = resource busy
3 = resource unavailable
4 to 7 = reserved
8 to 15 = user specific
Figure 26 Error code/Error class
