Constant Registers; Table 177: Register Address 0X2000; Table 178: Register Address 0X2001; Table 179: Register Address 0X2002 - WAGO -I/O-SYSTEM 750 Manual

262 Fieldbus Communication
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
Value
Access
Description

Table 178: Register Address 0x2001

Register address 0x2001 (8193
Value
Access
Description

Table 179: Register Address 0x2002

Register address 0x2002 (8194
Value
Access
Description

Table 180: Register Address 0x2003

Register address 0x2003 (8195
Value
Access
Description

Table 181: Register Address 0x2004

Register address 0x2004 (8196
Value
Access
Description

Table 182: Register Address 0x2005

Register address 0x2005 (8197
Value
Access
Description
Manual
1.5.0
750-882 Media Redundancy ETHERNET Controller
)
dec
Zero, GP_ZERO
Read
Constant with zeros
)
dec
Ones, GP_ONES
Read
Constant with ones
• –1 if this is declared as "signed int"
• MAXVALUE if it is declared as "unsigned int"
)
dec
1,2,3,4, GP_1234
Read
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.
)
dec
Mask 1, GP_AAAA
Read
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2004.
)
dec
Mask 1, GP_5555
Read
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2003.
)
dec
Maximum positive number, GP_MAX_POS
Read
Constant in order to control arithmetic.
WAGO-I/O-SYSTEM 750