Exception Status Definitions; Discrete Input Definitions; Control Register Definitions - GE PanaFlow MV80 User Manual

Chapter 4. Serial Communications
4.2.6g

Exception Status Definitions

The Read Exception Status command (function code 07) returns the exception status byte, which is defined as shown in
Table 11 below. This byte may be cleared by setting "coil" register #00003 (function code 5, address 2, data = 0xff00).
Bit(s)
0-1
4.2.6h

Discrete Input Definitions

The status of the three alarms may be monitored via the Modbus Read Discrete Input command (function code 02), as
shown in Table 12 below. 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
4.2.6i

Control Register Definitions

The only writable 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.
90
Table 11: Exception Status BIts
Byte order (see Modbus Order on "Modbus Order" on page 86)
•
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
Table 12: Alarm Status Registers
Variable
10001 Alarm #1 state
10002 Alarm #2 state
10003 Alarm #3 state
Definition
Function Code
02
02
02
PanaFlow™ MV80 & MV82 User's Manual
Address
0
1
2