Spirax Sarco RIM20, Инструкция по установке и обслуживанию, Страница: 87 / 132

IM-P198-05 MI Issue 2 87
5.6.1 Exception status definitions
The Read Exception Status command (function code 07) returns the exception status byte,
which is defined as follows. This byte may be cleared by setting"coil" register #00003 (function
code 5, address 2, data = 0xff00).
Bit(s) Definition
0-1 Byte order (see Modbus Order on page 2)
0 = 3-2:1-0 1 = 2-3:0-1
2 = 1-0:3-2 3 = 0-1:2-3
2 Temperature sensor fault
3 Pressure sensor fault
4 A/D converter fault
5 Period overflow
6 Pulse overflow
7 Configuration changed
5.6.2 Discrete input definitions
The status of the three alarms may be monitored via the Modbus Read Discrete Input
command (function code 02). The value returned indicates the state of the alarm, and will
be 1 only if the alarm is enabled and active. A zero value is transmitted for alarms that are
either disabled or inactive,
Registers Variable Function code Address
10001 Alarm #1 state 02 0
10002 Alarm #2 state 02 1
10003 Alarm #3 state 02 2
5.6.3 Control register definitions
The only writeable registers in this implementation are the Reset Exception Status, Reset
Meter and Reset Totalizer functions, which are implemented as"coils" which may be written
with the Write Single Coil command (function code 05) to address 8 through 10, respectively,
(register #00009 through #00011).
The value sent with this command must be either 0x0000 or 0xff00, or the meter will respond
with an error message; the totalizer will be reset or exception status cleared only with a value
of 0xff00.