262 Fieldbus Communication
WAGO-I/O-SYSTEM 750
750-882 Media Redundancy ETHERNET Controller
Manual
1.5.0
12.2.5.6 Constant Registers
The following registers contain constants, which can be used to test
communication with the master:
Table 177: Register Address 0x2000
Register address 0x2000 (8192
dec
)
Value
Zero, GP_ZERO
Access
Read
Description
Constant with zeros
Table 178: Register Address 0x2001
Register address 0x2001 (8193
dec
)
Value
Ones, GP_ONES
Access
Read
Description
Constant with ones
• –1 if this is declared as "signed int"
• MAXVALUE if it is declared as "unsigned int"
Table 179: Register Address 0x2002
Register address 0x2002 (8194
dec
)
Value
1,2,3,4, GP_1234
Access
Read
Description
This constant value is used to test the Intel/Motorola format specifier. If the master
reads a value of 0x1234, then with Intel format is selected – this is the correct
format. If 0x3412 appears, Motorola format is selected.
Table 180: Register Address 0x2003
Register address 0x2003 (8195
dec
)
Value
Mask 1, GP_AAAA
Access
Read
Description
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2004.
Table 181: Register Address 0x2004
Register address 0x2004 (8196
dec
)
Value
Mask 1, GP_5555
Access
Read
Description
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2003.
Table 182: Register Address 0x2005
Register address 0x2005 (8197
dec
)
Value
Maximum positive number, GP_MAX_POS
Access
Read
Description
Constant in order to control arithmetic.