Simex SLN-94, Руководство пользователя

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User manual - COUNTER SLN-94
Principle of operation of batcher function from example 3
After press of [ START pouring ] button (Figure 6.2) value “0” is showed on the display. It
causes of closing of both relays (only if Pr1 > Pr2 – both valves are opened). Flow meter
generates pulses delivered to counting input {
A
}, so counter increases it's value. When
counter up counts over Pr1-Pr2 value, then relay R2 will be opened – main valve will start to
close itself. Pouring is being continued, via additional valve. When counter reach Pr1
threshold value, relay R1 will be opened – additional valve will be closed. Pouring is finished.
Next pouring cycle can be initiated by [ START pouring ] button.
9. THE MODBUS PRO TOCOL HANDLING
Transmission parameters: 1 start bit, 8 data bits, 1 or 2 stop bit (2 bits are send, 1 and 2 bits
are accepted when receive), no parity control
Baud rate: selectable from: 1200 to 115200 bits/second
Transmission protocol: MODBUS RTU compatible
The device parameters and display value are available via RS-485 interface, as HOLDING-
type registers (numeric values are given in U2 code) of Modbus RTU protocol. The registers
(or groups of the registers) can be read by 03h function, and wrote by 06h (single registers) or
10h (group of the registers) accordingly to Modbus RTU specification. Maximum group size for
03h and 10h functions can not exceeds 16 registers (for single frame).
The device interprets the broadcast messages, but then do not sends the answers.
9.1. LIST OF REGISTERS
Register Write Range Register description
01h No
02h No
depending on
settings
Display value - higher word.
Display value - lower word.
03h No see descr.
The status of the displayed value:
0000h
- data valid,
0080h
- overflow
0040h
- underflow
04h
2
Yes see descr.
State of precounter - this is internal modulo N counter, where N =
“div” , overfill of this counter causes increasing/decreasing of main
counter.
05h 2 Yes see descr. Main counter value - high word
06h 2 Yes see descr. Main counter value - low word.
07h 3 Yes see descr. “Pr1”
parameter in
“rL1”
menu (higher word).
08h 3 Yes see descr.
“Pr1” parameter in “rL1” menu (lower word).
Cumulative value of registers 07h i 08h: from 0 to 999
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