B&B Electronics ZXT9-IOA-KIT - Manual - Manual (Page 46)

Configuration & Operation
40 Manual Documentation Number: ZXTx-IO-x-4113m
6.1.3.3 Modbus I/O Addressing
The following examples show how the Modbus addressing works especially when viewed from a Modbus Master:
In general, Modbus protocol allows two types of I/O addressing: implied and extended. However, Zlinx Xtreme I/Os support
implied I/O addressing only and uses HEX format. The addressing format ignores the I/O type digit (0 for DO, 1-for DI, 3 for AI
and 4 for AO) and address number is the same irrespective of the I/O type.
DO DI AI AO Modbus Memory Address
00001 10001 30001 40001 Ox0001
00002 10002 30002 40002 Ox0002
00003 10003 30003 40003 Ox0003
00004 10004 30004 40004 Ox0004
00005 10005 30005 40005 Ox0005
00006 10006 30006 40006 Ox0006
00007 10007 30007 40007 Ox0007
00008 10008 30008 40008 Ox0008
00009 10009 30009 40009 Ox0009
00010 10010 30010 40010 Ox000A
00011 10011 30011 40011 Ox000B
00012 10012 30012 40012 Ox000C
00013 10013 30013 40013 Ox000D
00014 10014 30014 40014 Ox000E
00015 10015 30015 40015 Ox000F
00016 10016 30016 40016 Ox0010
Fig 6-13 I/O Addressing Table
The function code will specify the holding register operation
For example:
- Function code 2 associated with register Ox000B means read from digital input register 10011
- Function code 6 associated with register Ox000B means write to analog output register 40011
6.1.4 Peer-to-Peer Mode Settings
Peer-to-Peer mode is ideal for wire replacement applications involving analog and/or digital I/Os. A typical application is to
control/monitor remote devices from a PLC or SCADA system where laying cables is too expensive or cannot be done for any
reason.
In Peer-to-Peer mode, digital and analog signals can be wirelessly transmitted in both directions between two Zlinx I/O
modules. The Zlinx I/O modules shall be indoor or outdoor (Zlinx Xtreme) type .For successful communication both Xtreme
Modules must be of the same frequency type and have similar I/O count, i.e. analog and digital inputs of one module shall
equal the analog and digital outputs of the other module and vice versa. One module is configured as Peer-to-Peer Master and
other is configured as Peer-to-Peer Slave. It does not matter which one is configured as Master. Additionally, Peer-to-Peer
Master address MUST match the Peer- to-Peer Slave address (1-255).
6.1.4.1 Peer-to-Peer Master
To configure the Zlinx Xtreme I/O Xtreme Module for Peer-to-Peer Master Mode:
1. Select the Configuration tab.
2. Select the Peer-to-Peer Master option button.
3. Set the Peer-to-Peer Master address from 1 to 255. Please note the Peer-to-Peer Slave address must also match.
4. The Polling Rate box contains the number of seconds between polls by the Master. The default value of 1 second is usually
satisfactory. The range of values is 0 seconds to 20 seconds. If the I/O points are not updating properly, try increasing the
value.