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Watlow EZ-ZONE
®
ST • 26 • Chapter 2 Install and Wire
Setting the Address
Modbus Controller Address
The address of an EZ-ZONE
®
ST controller with the
Modbus option (ST _ _-_ _ M _-_ _ _ _) can be set to
ranges from 1 to 8 using the DIP switch and ranges
1 to 247 using software.
Set switch 4 to on to use Modbus communications.
Modbus™ RTU addresses from 1 to 247 can be pro-
grammed into the controller using Standard bus
communications. Only one controller can be con-
nected to the network while changing the address
using communications. After the Modbus address is
changed, all four DIP switches must be turned on
(set to 8) and the controller restarted for the new ad-
dress be become available on the Modbus network.
The Modbus addresses set by software will override
only address 8, but lower addresses set on the DIP
switch will override the software-assigned addresses.
As many as 247 controllers can be connected to a
network.
The Standard bus address of an EZ-ZONE ST con-
troller with the Modbus™ RTU option (ST _ _-_ _ M
_-_ _ _ _) ranges from 1 to 8, because DIP switch 4 is
reserved for switching Modbus on or off.
DIP Switch
Zone 1 2 3 **4
1 off off off on
2 on off off on
3 off on off on
4 on on off on
5 off off on on
6 on off on on
7 off on on on
**8 on on on on
**1 to 247 on on on on
** Set switch 4 to on to use Modbus communications. Mod-
bus addresses from 1 to 247 can be programmed into the
controller using Standard bus communications when switch
4 is off. After the Modbus address is changed, all four DIP
switches must be turned on (set to 8) for the new address to
become available on the Modbus network.
1 2 3 4
ON
98
99
CF
CD
CE
B5
D6
D5
L2
K2
T1
S1
R1
L3
K3
J3
A1
L4
T2
S2
R2
2
1
EZ-ZONE™ ST
Patent Pending
Integrated Control Loop
LIMIT
OUT 3
SSR
STATUS
OUT 2
Control
Address
Selection
Communica-
tions
Parameter
Name
Range
Modbus
(less 400,001
offset)
Data
Type
&
Read/
Write
Address (when
all four DIP
switches are set
to on)
* 1 to 247 Map 1 Map 2
313 2052
uint
RW
Baud * 9,600 (188)
19,200 (189)
38,400 (190)
Map 1 Map 2
314 2054
uint
RWE
Parity Even (191)
Odd (192)
* None (61)
Map 1 Map 2
315 2056
uint
RWE
Word Order * Lowhigh (1331)
Highlow (1330)
Map 1 Map 2
- - - - 2058
uint
RWE
Non-Volatile
Save
(ST Firmware 2
and higher)
* Yes (106)
No (59)
Map 1 Map 2
317 2084
uint
RWE
* Defaults
Note:
Changing the Modbus parameters listed above
must be done over Modbus using ST firmware re-
lease 2.0 and earlier. For firmware release 3.0 and
above using either an RUI or EZ-ZONE Configura-
tor software, navigate to the Setup Page and then
to the Com [Com] (RUI representation) menu to
change.
CAUTION:
Changes set over Modbus are immediate. Users will
not be able to communicate with the controller after
its address, parity or baud rate has been changed.
The master device will need to be re-configured to
the new settings.
Saving Settings to Nonvolatile Memory
When controller settings are entered using the op-
tional RUI, changes are always saved to Non-volatile
Memory (EEPROM). If the controller loses power or
is switched off, its settings will be restored when it
starts again.
The EEPROM will wear out after about 1,000,000
writes, which would not be a problem with changes
made from the RUI. However, if the controller is re-
ceiving changing instructions from a PLC or a com-
puter through a network connection, the EEPROM
could, over time, wear out. The Non-volatile Memory
Save parameter allows the user to save settings
made over the network to either volatile or non-
volatile memory.
By default, settings made through the network
are saved to non-volatile memory.
Note:
Changing Non-volatile Memory Save must be done
over the network using ST firmware release 2.0
and earlier. For firmware release 3.0 and above us-
ing either an RUI or EZ-ZONE Configurator soft-
ware, navigate to the Setup Page and then to the
Com [Com] (RUI representation) menu to change.
- User’s Manual 1
- Integrated Control Loop 1
- Electrical Shock Hazard 2
- Table of Contents 3
- Table of Contents (cont.) 4
- Chapter 1: Overview 5
- A Conceptual View of the ST 6
- Getting Started Quickly 7
- ST System Diagram 8
- ST with 25A or 40A Contactor 9
- Wa tlow EZ-ZONE 11
- STATUS Indicator Light 11
- Watlow EZ-ZONE 12
- Ground Connection 13
- Limit Power 14
- Sub-assembly Labels 15
- Installation 16
- ST Isolation Block 19
- Input 1 Thermocouple 20
- Input 1 RTD 20
- Input 1 Process 20
- Input 2 Thermocouple 21
- Input 2 RTD 21
- Input 2 Process 21
- Digital Input 5 - 6 22
- Safe Operating Area 23
- Digital Output 5 - 6 25
- Quencharc Wiring Example 25
- Modbus RTU or 26
- Standard Bus EIA-485 26
- 27
- Setting the Address 28
- Chapter 3: Operations Pages 32
- Offset the input reading to 33
- Chapter 4: Setup Pages 41
- Setup Page 42
- R: Read 43
- W: Write 43
- S: User 43
- Apply an offset to the cur 52
- Chapter 5: Profiling Page 56
- Chapter 6: Factory Pages 61
- Change this value to 65
- Chapter 7: Features 66
- Temperature 67
- Autotuning with TRU-TUNE+ 68
- Before Tuning 68
- How to Autotune a Loop 68
- Calibration Offset 68
- Range Low and Range High 70
- On-Off Control 71
- Proportional Control 71
- Set Point 73
- Heating System with Ramping 74
- Alarm Silencing 75
- Alarm Blocking 75
- Lockout Menu 75
- Using Password Security 76
- Software Configuration 78
- Chapter 8: Appendix 81
- ST • 80 • Appendix 82
- ST • 81 • Appendix 83
- ST • 82 • Appendix 84
- ST • 83 • Appendix 85
- CIP Implicit Assembly 86
- Specifications 87
- Ordering Information 88
- ST • 87 • Appendix 89
- Code Number 90
- [`id;S] Idle Set Point 33 91
- Electrical Output Slope 63 92
- • 91 • Appendix 93
- • 92 • Appendix 94
- Declaration of Conformity 95
- How to Reach Us 97
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