Honeywell SV2 Series User Manual page 210

SV2 Series Safety Shut-off Valves
Category Item
Valve body Pressure access location
cover
Pressure access port plug,
1/8 in (3mm) NPT or BSP
NOVV plug ¾ in NPT
1 in (DN25) valves
Chassis ground wire
(underneath solenoid cover)
MODBUS COMMUNICATION ADDRESSING
Honeywell SV2 Series valves include a Honeywell specific secure Modbus protocol. Standard Modbus RTU protocol is used,
however, safety-related and writable parameters are covered by a secure layer. As a result, they are only writable when accessed
using a valid user access level and appropriate user interfaces, which are designed to work with the secure layer. The Modbus
addresses shown in this section are readable only.
Table 28.
Supported Function Description
Read input register
Read holding register
Write single register
Write multiple registers
Read SV2 Series valve status (refer to
Picture
-001
Tables 29, 30 and 31)
210
M37175
M37176
M37177
MCR37178
Function Code
4
3
6
16
17
Maximum Tightening
Torque
Nm In-lbf
1.36-1.81 12-16
6-8 53-71
72-88 637-779
(53-65 ft-
lbf)
4-5 35-44
32-00029—02