Delta RMC101 User Manual
Page 455
Modbus Plus 5.3
Communications
5-205
Status
Type
Word
Index
MSB
Node
Global
Input
0
16
15
14
13
12
11
10
9
1
32
31
30
29
28
27
26
25
2
48
47
46
45
44
43
42
41
3
64
63
62
61
60
59
58
57
Specific
Output
4
16
15
14
13
12
11
10
9
5
32
31
30
29
28
27
26
25
6
48
47
46
45
44
43
42
41
7
64
63
62
61
60
59
58
57
Specific
Input
8
16
15
14
13
12
11
10
9
9
32
31
30
29
28
27
26
25
10
48
47
46
45
44
43
42
41
11
64
63
62
61
60
59
58
57
Control Block
The nine control-block registers are assigned in a Peer Cop Health operation as shown:
Register
Content
1st
Operation
: 9
2nd
Error Status
: This register is filled by the
operation. See MSTR Block Error Codes for a
complete list.
3rd
Length
: Indicates the number of words to transfer.
4th
Word Index
: Gives the index of the first Peer Health word
to read.
5th-9th Routing 1-5: Unused. Set zeros.
Example
Suppose that we have an RMC device on a Modbus Plus network with a node address of 3. We
want to set a coil called ”r;disconnected” when the RMC is not found on the network. We will read
one of the four Peer Cop Global Input Health registers into register 400200. We must first choose
a location for the 9-register control block. In this example, 400130 to 400138 is the location. The
following network would be used: