11. Connection to other devices
11.4 Modbus TCP
Function code
Modbus
Modbus
reg. #
Operand Description Remark
0x02 (Read dis-
crete input) Max.
512 inputs at once,
8 inputs are
grouped into a
byte
1 I1 Bit input 1 Local inputs base device
… … …
8 I8 Bit input 8
17 I17 Expansion bit input local inputs expansion
… … …
128 I128 Expansion bit input
1001 M1 Marker bit 1
… … …
1512 M512 Marker bit 512
2001 N1 NET marker bit 1 Only the local NET marker bits
and no marker bits of the other
stations are returned
… … …
2512 N512 NET marker bit 512
3001 ID1 Diagnostics bit 1 Diagnostics for base device
… … …
3024 ID24 Diagnostics bit 24
0x04 (Read Input
Register) Max. 125
registers at once, 1
register = 2 bytes /
1 word
1 IA1 Value input 1 16Bit Local analog inputs base
device
… … …
8 IA8 Value input 8 16Bit
17 IA17 Value input 16Bit Local analog inputs expansion
… … …
48 IA48 Value input 16Bit
1001 MW1 Marker word 1
… … …
1512 MW512 Marker word 512
2001 NW1 NET marker word 1 Only the local NET marker
words will be returned, i.e.,
accessing NET markers from
other nodes is not possible.
NET marker bytes and NET
marker double words can be
calculated based on the NET
marker words.
… … …
2032 NW32 NET marker word 32
If a function code is used on Modbus registers that are not listed (gray), a value of 0 or an exception code will be returned.
558
easyE4 11/18 MN050009 EN www.eaton.com
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