Valvcon IVO (Intelligent Valve Operator) via 3100-MCM
Problem Solution Overview
We performed testing between the subject device and our 3100-MCM product.
Solution Brief
Our testing generated the following results:
- We were able to successfully communicate with the device. (see below for configuration parameters used during the testing)
- The product supported Modbus functions 3,4 & 6
- The average message response time was 5 ms.
Configuration:
The product testing was performed with the following settings used:
- Baud: 9600
- Parity: None
- Stop: 1
- Mode: RTU Master Mode
- Physical Connection : RS-485
The Module Configuration used in our testing was as follows:
|
Address
|
0
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
|
N7:0
|
0
|
0
|
5
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:10
|
1
|
1
|
5
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:20
|
4
|
1
|
2
|
130
|
150
|
0
|
0
|
0
|
4
|
0
|
This configuration, in combination with the example ladder logic referenced below, generates the following memory map:
N10:0 to N10:129 - Slave Data
N10:130 to N10:149 - Slave Error Table (Contains revision level information also)
N10:150 to N10:199 - Master Error Table (Contains status of commands for diagnostics)
Command List:
The following command list shows some of the commands which were used to test the communications:
|
Address
|
0
Port
Number
|
1
Slave
Number
|
2
Function
Code
|
3
Source
Address
|
4
Count
|
5
Dest
Address
|
6
Read
Time
|
7
Polling
Time
Preset
|
|
N7:50
|
1
|
1
|
3
|
8
|
1
|
0
|
0
|
0
|
|
N7:60
|
1
|
1
|
4
|
7
|
1
|
1
|
0
|
0
|
|
N7:70
|
1
|
1
|
6
|
200
|
0
|
1
|
0
|
0
|
|
N7:80
|
1
|
1
|
6
|
201
|
0
|
0
|
0
|
0
|
Our test command list perfoms the following functions.
Cable Connection:
The physical connection which was used during testing was as follows:
|
3100-MCM Module
|
|
Valvcon J5 connections
|
|
14 TxRxD+
|
----------------------
|
J5 - 6
|
|
25 TxRxD-
|
----------------------
|
J5 - 5
|
|
7 GND
|
----------------------
|
J5 - 4
|
|
4 RTS
|
----------|
|
|
|
5 CTS
|
----------|
|
|
Additional Comments and Observations:
- The cable connections listed are based on CPU Board 1519 J5 terminal block for RS-485 two wire communications.
- When referring to the Valvcon documentation remember to use subtract 1 from the listed address for use in our command list.
|
