Honeywell SV2 Series User Manual page 211

Table 29. Query Message Format for SV2 Series Valve Status / Function Code 17.
Node Address Function Code
Varies (1 byte)
Table 30. Response Message Format for SV2 Series Valve Status / Function Code 17.
Node Function
Address Code
Varies 17 (1 byte)
(1 byte)
Table 31. System States.
State Number Alias
0 NormalOperation
1 SoftLockout
2 HardLockout
3 Lockout
6 GasON
7 GasOFF
13 StartUp
14 Reset
15 Run
16 InterlockStringTest
17 SafetyRelayTest
The SV2 Series valve Modbus address space is organized in two segments; holding registers and input registers. Refer to
Table 32 for the read and write access function codes.
Table 32. Modbus Function Codes.
Segment
Holding registers
Input registers
The Holding Register limits and attributes are as follows:
• The minimal value that can be written into a Holding Register <address> can be read from the Holding Register <address +
10000>.
• The maximum value that can be written into a Holding Register <address> can be read from the Holding Register <address +
20000>.
The bit array register attributes of a Holding Register <address> can be read from the Holding Register <address+30000>. The
meaning of Holding Register bits 0-3 can be found in
SV2 Series Safety Shut-off Valves
V2F, V2V
CRC
17 (1 byte) Low, High (2 bytes)
Number SV2 Valve
Response State
Bytes Number
35 Refer to
Table 31.
(1 byte)
Description
SV2 valve is operable.
Soft-lockout. Recovery after 1 hour or upon a user reset.
Soft-lockout. Recovery upon a user reset.
Hard or Soft lockout(s) are active.
Gas is running – both SSOVs are opened.
Gas is stopped – at least one SSOV is closed.
Safety tests performed after power-up or after lockout is terminated.
User has pressed a push-button during normal operation. Gas valves are turned
OFF and faults are cleared.
Valve has gone through StartUp and is running.
An interlock string test performed after power-up or after lockout is cleared.
A safety relay test performed after power-up or after lockout is cleared.
Read Access Function Code
3
4
Table
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
SV2 Valve Factory Data
String terminated by 0 or maximum size 62 characters
Write Access Function Code
6 or 16
----
33.
211
CRC
Low, High
(2 bytes)
Access
Read / Write
Read Only