Tekmar Snow Melting Control 680 Use and care manual

Snow Melting Control 680
680 _ B
10/15
Replaces: 04/15
BAS Integration Manual
© 2015 680_B - 10/15
1 of 8
A Watts Water Technologies Company
Snow Melting
Introduction
Table of Contents
BACnet Protocol Implementation Conformance
Statement (PICS) ......................................................... 2
BACnet Connection ...................................................... 2
BACnet Analog Parameters .......................................... 3
BACnet Binary Parameters ........................................... 4
Modbus Specification ................................................... 5
Modbus Connection ...................................................... 5
Modbus Troubleshooting .............................................. 5
Modbus Parameters ..................................................6-7
Error Codes ..................................................................8
The Snow Melting Control 680 can communicate with a Building Automation System (BAS) using either BACnet
®
I P,
BACnet® MSTP or Modbus® MSTP.
This manual provides information about control parameters that can be accessed by building automation or management
systems that use BACnet or Modbus communication.
1234
Injection
Mixing
Pmp
46 47
N
Snow Melting Control 680
BAS, Boiler & Mixing
37 38
Mod
Boiler
33 34
Stage 1Stage 2
35 36
+
-
BACnet IP
Signal wiring must be
rated at least 300 V
For product literature:
www.tekmarControls.com
Meets Class B: Canadian
ICES & FCC Part 15
tektra 1070-01
Designed and
assembled in Canada
H7021B
Input Power:
115 V (ac) ±10%, 60 Hz, 320 VA
Primary, System Pump Relays:
230 V (ac), 10 A, 1/2 hp
Boiler Stage Relays:
230 V (ac), 5 A
Injection Mixing Pump:
230 V (ac), 2.4 A
Boiler Pump Relay:
230 V (ac), 5 A, 1/3 hp
Floating Action Mixing Output:
230 V (ac), 5 A
BluBrn /
Slab
25
Blk /
Com
26 27 28
Red
19
Brn /
Slab
20
Blk /
Com
Yel
21
Red
24
Blu
22
Yel
23
Snow / Ice Sensor 1Snow / Ice Sensor 2
Do Not Apply Power
41 42 43
Pwr
Floating
Action Mixing
ClsOpn
Boiler
39 40
Pump
Pump
29 30
Pump
Primary System
31 32 44 45
Power In
NL
BACnet MSTP
Modbus MSTP
16 17 18
Gnd
BA
RS-485
+–
20V
3
dc
5V
dc
Out
0-10V /
4-20mA In Out
Flow
Sensor
Pressure
Sensor
In
Vdc
6
Gnd
7
mA
45
+Com
8
Boil
Sup
Out
9
Boil
Ret
10
ComCom
11
Sys
Sup
12
Sys
Ret
13 14 15
+
1
Analog
Mixing
2
Temperature Sensors
+––
Disconnect All Power
Before Opening
Use supply wires suitable for at least 105°C
Employer des fils d’alimentation pour au moins 105°C
Do Not Apply Power

© 2015 680_B - 10/15
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A Watts Water Technologies Company
Vendor Name: tekmar Control Systems Ltd.
Vendor ID: 585
Product Name: Snow Melting Control 680
Product Model Number: 680
Application Software Version: J1243F Firmware Revision: J1243F BACnet Protocol Revision: 10
Product Description:
The 680 is a control that operates an automatic snow melting system.
Supported BIBBs (Annex K) Name
DS-RP-B Data Sharing-ReadProperty-B
DS-RPM-B Data Sharing-ReadPropertyMultiple-B
DS-WP-B Data Sharing-WriteProperty-B
DM-DDB-B Device Management-Dynamic Device Binding-B
DM-DOB-B Device Management-Dynamic Object Binding-B
DM-DCC-B Device Management-Device Communication Control-B
*DeviceCommunicationControl password is tekmar.
Data Link Layer Supported
BACnet IP (Annex J) Yes
BACnet MSTP Yes
Character Set Supported
ANSI X3.4 Yes
Device Address Binding Supported
Static Device Address Binding No
BACnet Standardized Device Profile (Annex L)
BACnet Application Specific Controller (B-ASC)
Standard Object Types Supported Creatable Deletable
Analog Input No No
Analog Value No No
Binary Input No No
Binary Value No No
Segmentation Capability Supported Window Size
Able to transmit segmented messages No
Able to receive segmented messages No
Network Security Options
Non-secure Device
BACnet Protocol Implementation Conformance Statement (PICS)
BACnet-IP Connection
Use a top or back knock-out to bring a CAT-5E or CAT-
6 wire into the wiring chamber. Connect the 680 to the
BACnet-IP network switch using the RJ45 port on the top
edge of the control board.
BACnet-MSTP Connection
• Cable length must not exceed 150 ft. (45 m) for CAT-5E
or 300 ft. (90 m) for CAT-6.
• If the cable was manually made, check continuity across
each of the wires.
Use a top or back knock-out to bring a shielded twisted pair wire from the nearest BACnet RS485 connection point into the
wiring chamber. Wire the A, B & G conductors from the BACnet point to the 680 A, B & Gnd terminals.
• Gnd should not be connected to the ground screws in the 680.
• If 120 Ω terminating resistors are installed, then biasing resistors located at the BACnet master are required.

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Object
ID
Name Data
Type
Read/
Write
Units Range/Value
Analog Input Objects
0 Operation AI R No Units (95)
0 = Off, 1 = Idle,
2 = Storm, 3 = Melt,
4 = Manual Override
1 Operation Status AI R No Units (95)
0 = Normal, 1 = WWSD,
2 = CWSD, 3 = Timed Melting,
4 = Warming Up, 5 = Pending
2 Melt Time Remaining AI R Hours (71) 0 to 24:00 hours
3 Additional Melt Time Remaining AI R Hours (71) 0 to 6:00 hours
4 Outdoor Air Temperature AI R °F (64) -67 to 149°F
5 Slab 1 Temperature AI R °F (64) -58 to 167°F
6 Slab 2 Temperature AI R °F (64) -58 to 167°F
7 Coldest Slab Temperature AI R °F (64) -58 to 167°F
8 Slab Target Temperature AI R °F (64) 20 to 120°F
9 Boiler Supply Temperature AI R °F (64) -31 to 266°F
10 Boiler Return Temperature AI R °F (64) -31 to 266°F
11 Boiler Target Temperature AI R °F (64) 50 to 230°F
12 Boiler Output AI R % (98) 0 to 100%
13 System Supply Temperature AI R °F (64) -31 to 266°F
14 System Return Temperature AI R °F (64) -31 to 266°F
15 Mix System Target Temperature AI R °F (64) 50 to 230°F
16 Mix System Output AI R % (98) 0 to 100%
17 PWM and Electric Heat Output AI R % (98) 0 to 100%
18 System Flow Rate AI R US GPM (89) 0 to 1000 GPM
19 System Pressure AI R PSI (56) 0 to 300 psi
19 Melting Energy AI R Therms (21) 0 to 65535 Therms
21 Melting Hours AI R Hours (71) 0 to 65535 Hours
22 Heat Cycles AI R No Units (95) 0 to 65535 Cycles
23 System Pump Run Time AI R Hours (71) 0 to 65535 Hours
24 Primary Pump Run Time AI R Hours (71) 0 to 65535 Hours
25 Boiler Pump Run Time AI R Hours (71) 0 to 65535 Hours
26 Error Code AI R No Units (95) See Error Codes list
Analog Value Objects
0BAS Outdoor Air Temperature AV R/W °F (64) -67 to 149°F
1Melt Setpoint AV R/W °F (64) 32 to 95°F
2Idle Setpoint AV R/W °F (64) 20 to 95°F, 0 = off
3Storm Setpoint AV R/W °F (64) 20 to 95°F, 0 = off
4Manual Melt Time AV R/W Hours (71) 0:30 to 24:00 Hours
5Add Melt Time AV R/W Hours (71) 0:00 to 6:00 Hours
6Storm Run Time AV R/W Hours (71) 0:30 to 24:00 Hours
7Snow/Ice Sensitivity 1 AV R/W No Units (95) 0 = Auto, 1 = Min, 2 = -2, 3 = -1,
4 = Mid, 5 = +1, 6 = +2, 7 = Max
8Snow/Ice Sensitivity 2 AV R/W No Units (95) 0 = Auto, 1 = Min, 2 = -2, 3 = -1,
4 = Mid, 5 = +1, 6 = +2, 7 = Max
9Warm Weather Shut Down AV R/W °F (64) 32 to 95°F
10 Cold Weather Cut Out AV R/W °F (64) -30 to 50°F
BACnet Analog Parameters
Analog Input Object = AI Analog Value Object = AV Read = R Read/Write = R/W

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Object ID Name Data Type Read / Write Units Range/Value
Binary Input Objects
0 Slab 1 Water BI R No Units (95) 0 = Dry, 1 = Wet
1 Slab 2 Water BI R No Units (95) 0 = Dry, 1 = Wet
2 Combined Water Status BI R No Units (95) 0 = Dry, 1 = Wet
3 System Pump BI R No Units (95) 0 = Off, 1 = On
4 Primary Pump BI R No Units (95) 0 = Off, 1 = On
5 Boiler Pump BI R No Units (95) 0 = Off, 1 = On
6 Boiler Stage 1 BI R No Units (95) 0 = Off, 1 = On
7 Boiler Stage 2 BI R No Units (95) 0 = Off, 1 = On
Binary Value Objects
0Outdoor Sensor Enable BV R/W No Units (95)
0 = Control to measure
outdoor air temperature
1 = BAS to send
outdoor air temperature
1Melt/Stop Request BV R/W No Units (95) 0 = Off, 1 = Melt
2Storm/Stop Request BV R/W No Units (95) 0 = Off, 1 = Storm
3Idle Enable BV R/W No Units (95) 0 = Idling disabled,
1 = Idling enabled
4Storm Enable BV R/W No Units (95) 0 = Storm disabled,
1 = Storm enabled
5WWSD Enable BV R/W No Units (95) 0 = WWSD disabled,
1 = WWSD enabled
6CWCO Enable BV R/W No Units (95) 0 = CWCO disabled,
1 = CWCO enabled
Refer to the Installation & Operation Manual 680_D for additional information.
Troubleshooting
If there is no communication, check the following:
• Check the ethernet cable. Cable length must not exceed 150 ft. (45 m) for CAT-5E or 300 ft. (90 m) for CAT-6.
• If the cable was manually made, check continuity across each of the wires.
If there is intermittent communication, check the following:
• Check the ethernet cable. Cable length must not exceed 150 ft. (45 m) for CAT-5E or 300 ft. (90 m) for CAT-6.
BACnet Binary Parameters
Binary Input Object = BI Binary Value Object = BV Read = R Write = W

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Communication Protocol Modbus over RS-485
Physical Layer RS-485 two-wire plus signal ground
Baud Rate 9600, 19200, 38400, 768000 (default: 9600 bps)
Recommended Cable 18 AWG shielded, twisted pair (STP)
Transmission Mode RTU or ASCII (default: RTU)
Maximum Cable Length 76800 bps: 580 ft. (177 m)
57600 bps: 1,158 ft. (353 m)
19200, 9600 bps: 3,280 ft. (1,000 m)
3,280 ft (1,000 m) for all baud rates if 120 Ohm terminating resistors used
Start Bit 1 bit
Data Length 8 bits for RTU mode
7 bits for ASCII mode
Parity None (2 stop bits)
Even (1 stop bit)
Odd (1 stop bit)
(default: Even)
Addressing 1 to 247
(default: 1)
Modbus Specification
Modbus Connection
Use a top or back knock-out to bring a shielded twisted pair wire from the nearest Modbus RS485 connection point into
the wiring chamber. Wire the A, B & G conductors from the Modbus point to the 680 A, B & Gnd terminals.
Gnd should not be connected to the ground screws in the 680.
Modbus Troubleshooting
If there is no communication, check the following:
• Check that the polarity on the Modbus A & B terminals
is correct.
• Check that Modbus GND terminal is securely
connected.
• Check that the baud rate is the same on both devices.
If the communication is intermittent, check the
following:
• Check that the communication cable is of the twisted
pair type.
• Reliable communication depends on the cable length
and baud rate used. Long cable length may require a
lower baud rate.

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Register Parameter Name Read/
Write Units Type
Format Range
Input Registers (Starts at 40,000)
1 Model R Enum Input U16 680
2 Firmware Revision R Enum Input U16 SVN revision
3 Application Version R Enum Input U16 Software (A= 1, B = 2, ...
Z = 26)
4 Error Code R Enum Input U16 See Error Codes list
5 Operation R Enum Input U16
0 = Off,
1 = Idle,
2 = Storm,
3 = Melt
6 Operation Status R Enum Input U16
0 = Normal,
1 = WWSD,
2 = CWSD,
3 = Timed Melting,
4 = Warming Up,
5 = Pending
7 Manual Melt Time Remaining R Minutes Input U16 0 to 1440 minutes
8 Additional Melt Time Remaining R Minutes Input U16 0 to 360 minutes
9 Outdoor Air Temperature R °F Input S16 -67 to 149°F
10 Slab 1 Temperature R °F Input S16 -58 to 167°F
11 Slab 1 Water R Enum Input U16 0 = Dry, 1 = Wet
12 Slab 2 Temperature R °F Input S16 -58 to 167°F
13 Slab 2 Water R Enum Input U16 0 = Dry, 1 = Wet
14 Coldest Slab Temperature R °F Input S16 -58 to 167°F
15 Slab Target Temperature R °F Input S16 20 to 120°F
16 Combined Water Status R Enum Input U16 0 = Dry, 1 = Wet
17 Boiler Supply R °F Input S16 -31 to 266°F
18 Boiler Return R °F Input S16 -31 to 266°F
19 Boiler Target R °F Input S16 50 to 230°F
20 Boiler Output R % Input U16 0 to 100%
21 System Supply R °F Input S16 -31 to 266°F
22 System Return R °F Input S16 -31 to 266°F
23 Mix System Target R °F Input S16 50 to 230°F
24 Mix System Output R % Input U16 0 to 100%
25 System Pump R Enum Input U16 0 = Off, 1 = On
26 Primary Pump R Enum Input U16 0 = Off, 1 = On
27 Boiler Pump R Enum Input U16 0 = Off, 1 = On
28 System Flow Rate R GPM Input U16 0 to 1000 US GPM
29 System Pressure R PSI Input U16 0 to 300 psi
30 PWM and Electric Heat Output R % Input U16 0 to 100%
31 Melting Energy (low word) R Therms Input U16 0 to 65535
32 Melting Energy (high word) R Therms Input U16 0 to 65535
Modbus Parameters
Read = R Read/Write = R/W

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Modbus Parameters
Read = R Read/Write = R/W
33 Melting Hours (low word) R Hours Input U16 0 to 65535
34 Melting Hours (high word) R Hours Input U16 0 to 65535
35 Heat Cycles (low word) R Enum Input U16 0 to 65535
36 Heat Cycles (high word) R Enum Input U16 0 to 65535
37 System Pump Run Time (low word) R Hours Input U16 0 to 65535
38 System Pump Run Time (high word) R Hours Input U16 0 to 65535
39 Primary Pump Run Time (low word) R Hours Input U16 0 to 65535
40 Primary Pump Run Time (high word) R Hours Input U16 0 to 65535
41 Boiler Pump Run Time (low word) R Hours Input U16 0 to 65535
42 Boiler Pump Run Time (high word) R Hours Input U16 0 to 65535
Holding Registers (Starts at 30,000)
1 Outdoor Sensor Enable R/W Enum Holding U16
0 = Control to measure
outdoor air temperature,
1 = BAS to send outdoor air
temperature
2 BAS Outdoor Temperature R/W °F
Holding S16 -67 to 149°F
3 Melt Setpoint R/W °F
Holding U16 32 to 95°F
4 Idle Enable R/W Enum
Holding U16 0 = Idling disabled,
1 = Idling enabled
5 Idle Setpoint R/W °F
Holding U16 20 to 95°F
6 Storm Enable R/W Enum
Holding U16 0 = Storm disabled,
1 = Storm enabled
7 Storm Setpoint R/W °F
Holding U16 20 to 95°F
8 Manual Melt Time R/W Hours
Holding U16 30 to 1440 minutes
9 Add Melt Time R/W Hours
Holding U16 0 to 360 minutes
10 Storm Run Time R/W Hours
Holding U16 30 to 1440 minutes
11 Snow/Ice Sensitivity 1 R/W Enum
Holding U16
0 = Auto, 1 = Min, 2 = -2,
3 = -1, 4 = Mid, 5 = +1,
6 = +2, 7 = Max
12 Snow/Ice Sensitivity 2 R/W Enum
Holding U16
0 = Auto, 1 = Min, 2 = -2,
3 = -1, 4 = Mid, 5 = +1,
6 = +2, 7 = Max
13 Warm Weather Shut Down Enable R/W Enum
Holding U16 0 = WWSD disabled
1 = Manual WWSD setting
14 Warm Weather Shut Down Temperature R/W °F
Holding S16 32 to 95°F
15 Cold Weather Cut Out Enable R/W Enum
Holding U16 0 = CWCO disabled
1 = Manual CWCO setting
16 Cold Weather Cut Out R/W °F
Holding S16 -30 to 50°F
17 Melt/Stop Request R/W Enum
Holding U16 0 = Off, 1 = Melt
18 Storm/Stop Request R/W Enum
Holding U16 0 = Off, 1 = Storm

Product design, software and literature are Copyright ©2015 by
tekmar Control Systems Ltd., A Watts Water Technologies Company
8 of 8 All specifications are subject to change without notice.
Printed in Canada. 680_B - 10/15.
tekmar Control Systems Ltd., A Watts Water Technologies Company. Head Office: 5100 Silver Star Road,
Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. [phone] Web Site: tekmarControls.com
Code Description
0No error
1Setpoint Menu Memory Error
2Setup System Menu Memory Error
3Setup Boiler Menu Memory Error
4Mixing Menu Memory Error
5BAS Menu Memory Error
6Low Pressure Alert
7Max Melt Days Error
8Outdoor Sensor Open Circuit Error
9Outdoor Sensor Short Circuit Error
10 System Supply Sensor Open Circuit Error
11 System Supply Sensor Short Circuit Error
12 System Return Sensor Open Circuit Error
13 System Return Sensor Short Circuit Error
14 Boiler Supply Sensor Open Circuit Error
15 Boiler Supply Sensor Short Circuit Error
16 Boiler Return Sensor Open Circuit Error
17 Boiler Return Sensor Open Circuit Error
Code Description
18 Slab Sensor 1 Open Circuit Error
19 Slab Sensor 1 Short Circuit Error
20 Snow Sensor 1 Yellow Wire Open Circuit Error
21 Snow Sensor 1 Blue Wire Open Circuit Error
22 Snow Sensor 1 Blue Wire Short Circuit Error
23 Snow Sensor 1 Brown Wire Open Circuit Error
24 Snow Sensor 1 Brown Wire Short Circuit Error
25 Snow/Ice Sensor 1 Error
26 Snow Sensor 1 Error
27 Slab Sensor 2 Open Circuit Error
28 Slab Sensor 2 Short Circuit Error
29 Snow Sensor 2 Yellow Wire Open Circuit Error
30 Snow Sensor 2 Blue Wire Open Circuit Error
31 Snow Sensor 2 Blue Wire Short Circuit Error
32 Snow Sensor 2 Brown Wire Open Circuit Error
33 Snow Sensor 2 Brown Wire Short Circuit Error
34 Snow/Ice Sensor 2 Error
35 Snow Sensor 2 Error
Error Codes (for BACnet and Modbus)
Detailed information on how to correct the error code is included in the Installation and Operation Manual 680_D available
at tekmarControls.com.