Emerson XM670 Installation And Operation Manual Download Page 49

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MODBUS Termination Blocks

Default Setting Values • 43

tdF

Pr1

Defrost type

EL(0) - in(0)

EdF

Pr1

Defrost mode: Interval

in(1)

Srt

150

Pr1

Heater setpoint during defrost

[-67°F to 302°F]

[-55.0°C to 150°C]

Hyr

2.0

Pr1

Differential for heater

[1°F to 45°F]

[0.1°C to 25.5°C]

tod

255

Pr1

Time out for heater

0 to 255 (min.)

dtP

0.1

Pr1

Minimum temperature difference to start

defrost

[1°F to 90°F]

[0.1°C to 50.0°C]

ddP

Pr1

Delay before starting defrost

0 to 60 (min.)

d2P

Pr1

Defrost with two probes

n(0) – Y(1)

dtE

8.0

Pr1

Defrost termination temperature



(Probe A)

[-67°F to 122°F]

[-55.0°C to 50.0°C]

dtS

8.0

Pr1

Defrost termination temperature



(Probe B)

[-67°F to 122°F]

[-55.0°C to 50.0°C]

idF

Pr1

Interval between defrosts

0 to 120 (hours)

MdF

Pr1

Defrost Maximum duration

0 to 255 (min.)

dSd

Pr1

Start defrost delay

0 to 255 (min.)

dFd

Pr1

Display during defrost

rt(0) - it(1) - SEt(2) - dEF(3)

dAd

Pr1

Defrost display time out

0 to 255 (min.)

Fdt

Pr1

Drain down time

0 to 255 (min.)

dPo

Pr1

Defrost at start-up

n(0) – Y(1)

dAF

0.0

Pr1

Defrost delay after continuous cycle

0 to 24.0(144)(hours.10min)

FAN

FPA

Pr1

Fan probe A

nP(0) - P1(1) - P2(2) - P3(3) - P4(4) -

P5(5)

FPb

Pr1

Fan probe B

nP(0) - P1(1) - P2(2) - P3(3) - P4(4) -

P5(5)

FPE

100

Pr1

Virtual probe percentage



(fan management)

0 to 100 (100=FPA, 0=FPb)

FnC

O-n

Pr1

Fan operating mode

C-n(0) - O-n(1) - C-y(2) - O-y(3)

Fnd

Pr1

Fan delay after defrost

0 to 255 (min.)

FCt

Pr1

Temperature differential to avoid short

cycles of fans

[0°F to 90°F]

[0.0°C to 50.0°C]

FSt

2.0

Pr1

Fan stop temperature

[-67°F to 122°F]

[-55.0°C to 50.0°C]

FHy

1.0

Pr1

Fan stop differential

[1°F to 45°F]

[0.1°C to 25.5°C]

Fod

Pr1

Fan activation time after defrost



(without compressor)

0 to 255 (min.)

Fon

Pr1

Fan ON time

0to15 (min.)

FoF

Pr1

Fan OFF time

0to15 (min.)

trA

UAL

Pr2

Kind of regulation for modulating output

UAL(0) - rEG(1) - AC(2)

SOA

Pr2

Fixed speed for fan

AMi to AMA

SdP

30.0

Pr2

Default Dew Point value

[-67°F to 122°F]

[-55.0°C to 50.0°C]

Table 23-1 - Default Setting Values (Continued)

Summary of Contents for XM670

Page 1: ...XM670 XM679 Controllers for Multiplexed Cabinets Installation and Operation Manual 026 1218 Rev 4 ...

Page 2: ......

Page 3: ...Emerson Commercial and Residential Solutions 1065 Big Shanty Road NW Suite 100 Kennesaw GA 30144 USA 770 425 2724 1 800 829 2724 www emerson com ...

Page 4: ......

Page 5: ...ION MENU 6 5 1 TO SET ENERGY SAVING TIMES 6 5 2 TO SET TIMED DEFROST PARAMETERS 6 6 ELECTRONIC EXPANSION VALVE MENU FOR MODEL XM679 ONLY 7 7 CONTROLLING LOADS 7 7 1 SOLENOID VALVE 7 7 2 STANDARDS REGULATION AND CONTINUOUS REGULATION 7 7 2 1 First Kind of Regulation Standard Regulation 8 7 2 2 Second Kind of Regulation Continuous Regulation For Model XM679 Only 8 7 3 DEFROST 8 7 3 1 Defrost startin...

Page 6: ...iring Guidelines 27 17 2 XM670 WIRING DIAGRAM 27 17 3 XM679 230VAC VALVES WIRING DIAGRAM 28 17 4 XM679 24VAC VALVES WIRING DIAGRAM 28 18 E2 MODBUS NETWORK WIRING 29 19 WIRING LAYOUT FOR SHARING A PRESSURE TRANSDUCER ON A LAN 30 20 PRESSURE TRANSDUCER SETUP XM679 ONLY 31 20 1 RS485 NET MONITORING TEMPERATURES 31 20 1 1 RS485 Connection 31 20 2 HOW TO ENABLE A PRESSURE PROBE TO SHARE ACROSS THE LAN ...

Page 7: ...ture measurement Model XM679 can exclusively have two 2 other probes that can be used for superheat measurement and regulation Both XM670 and XM679 controllers CAUTION This manual is part of the product and should be kept near the device for easy and quick reference The device should not be used for purposes different from those described in this manual It cannot be used as a safety device Check t...

Page 8: ...ial output RS485 MODBUS RTU compatible permits a simple XWEB interfacing Depending on the model the Hot Key connector can also be used to connect X REP display 2 3 Ordering Codes Device Name Description Emerson Part Number XM670 Solenoid Case Control 115V 318 6520 XM670 Solenoid Case Control 230V 318 6521 XM679 Pulse Case Control 115V 318 6700 XM679 Pulse Case Control 230V 318 6701 Table 2 1 Produ...

Page 9: ...room light ON and OFF Press for three 3 seconds to switch the device ON and OFF Measurement unit Measurement unit Measurement unit Measurement unit Key Combinations Locks Unlocks the keyboard Switches mode to programming mode Exits the programming mode 3 2 Use of LEDS LED Mode Function ON Compressor and valve regulation enabled To see the valve opening percentage enter the fast access menu Flashin...

Page 10: ... PR1 To enter the parameter list in Pr1 user accessible parameters 1 Enter the programming mode by pressing the SET and DOWN buttons for a few seconds wait for the measurement unit to start blinking 2 The controller will show the first parameter present in Pr1 3 8 How to Enter the Parameters List PR2 To access the parameter list in Pr2 1 Enter the Pr1 level Follow the steps in Section 3 7 How to E...

Page 11: ...e 1 Enter the programming mode 2 Select the required parameter using the UP or DOWN button 3 Press the SET key to display the parameter value measurement unit starts blinking 4 Use the UP or DOWN button to change the value 5 Press SET to store the new value and move to the next parameter 6 To exit press SET UP keys or wait 15 seconds without pressing a key 3 11 ON OFF Function By pressing the ON O...

Page 12: ...ed by probe 3 dP4 Probe 4 value displaying Shows the temperature measured by probe 4 dP5 Probe 5 value displaying Shows the temperature measured by probe 5 dP6 Probe 6 value displaying Shows the temperature measured by probe 6 dPP Pressure probe value Shows the value of pressure measured by pressure transducer Only XM679 rPP Remote pressure probe value Shows the value of pressure received by remot...

Page 13: ...s increased by the value in HES so that the operation setpoint is SET HES dLE Energy Saving cycle length during workdays 0 to 24 h 00 min Sets the duration of the EnergySavingcycleon workdays ISE Energy Saving cycle start on holidays 0 to 23h 50 min dSE Energy Saving cycle length on holidays 0 o 24h 00 min HES Temperature increase during the Energy Saving cycle 54 to 54 F 30 to 30 C Sets the incre...

Page 14: ...d when the temperature reaches the setpoint value again In case of fault in the thermostat probe the opening and closing time of the solenoid valve are configured by Con and CoF parameters 7 2 Standards Regulation and Continuous Regulation The regulation can be performed in two ways Standard regulation is reaching the best superheat via a classic temperature regulation obtained using hysteresis Co...

Page 15: ...on by means of the keyboard or digital input or end of interval time or the command can come from the Master defrost unit of the LAN In this case the controller will operate the defrost cycle following the parameters it has programmed but at the end of the drip time it will wait until all the other LAN controllers finish their defrost cycle before the normal regulation of the temperature is restar...

Page 16: ...e the SET ASr value and its value is PbA The fans are at minimum speed AMi when the temperature read by the fan probe is SET ASr and the fans are at maximum speed AMA when the temperature is SET ASr PbA 7 5 Anti Sweat Heaters If Present This control is performed when trA AC In this case there are two ways to control the anti sweat heaters Without real dewpoint information in this case the default ...

Page 17: ...sed for instance when the room is filled with new products CCS Setpoint for continuous cycle 67 to 302 F 55 to 150 C it sets the setpoint used during the continuous cycle Con Solenoid valve ON time with faulty probe 0 to 255 min The time during which the solenoid valve is active in case of faulty thermostat probe With COn 0 solenoid valve is always OFF CoF Solenoid valve OFF time with faulty probe...

Page 18: ...psed PEd Probe Error delay before stopping regulation 0 to 239 sec On unlimited if probe error duration is bigger than PEd then valve totally closes Pf message displays If PEd On valve opening is PEo until probe error finishes OPE Start opening Percentage 0 to 100 Valve opening percentage when start function is active This phase duration is SFd time SFd Start Function duration 0 0 to 42 0 min reso...

Page 19: ...perheat alarm Hysteresis 1 to 45 F 0 1 to 25 5 C Hysteresis for superheat alarm deactivation SHd Superheat alarm activation delay 0 0 to 42 0 min resolution 10s When a superheat alarm occurs the time SHd have to pass before signaling the alarm FrC Fast recovery Constant 0 to 100 s permits to increase integral time when SH is below the setpoint If FrC 0 fast recovery function is disabled DEFROST dP...

Page 20: ...val between reaching defrost termination temperature and the restoring of the control s normal operation This time allows the evaporator to eliminate water drops that might have formed due to defrost dPo First defrost after start up y Immediately n after the IdF time dAF Defrost delay after continuous cycle 0 to 23 5h time interval between the end of the fast freezing cycle and the following defro...

Page 21: ...5 5 C to 25 5 C PbA Differential for anti sweat heaters 1 F to 45 F 0 1 C to 25 5 C AMi Minimum value for analog output 0 to AMA AMA Maximum value for analog output Ami to 100 AMt Anti sweat heaters cycle period trA AC Time with fan at maximum speed trA rEG 0 to 255 s when the fan starts during this time the fan is at maximum speed ALARMS rAL Probe for temperature alarm nP P1 P2 P3 P4 P5 tEr Selec...

Page 22: ... 0 hours tens of minutes After regulating continuously for Sti time the valve closes for Std time to prevent ice from forming Std Stop duration Only XM679 0 to 60 min Defines the stop regulation time after Sti During this stop display shows StP message OA6 Sixth relay configuration CPr dEF Fan ALr LiG AUS db OnF CPr relay works as a compressor or solenoid valve relay dEF relay works as defrost rel...

Page 23: ...ity cL oP CL the digital input is activated by closing the contact OP the digital input is activated by opening the contact i3F Digital input 3 function EAL bAL PAL dor dEF AUS LiG OnF Htr FHU ES Hdy EAL external alarm bAL serious external alarm PAL pressure switch activation dor door open dEF defrost activation AUS auxiliary activation LiG light activation OnF switch on off the device Htr change ...

Page 24: ...tion has to display the local probe value or the value coming from another section y the displayed value is the one coming from another section which has parameter LdS y n the displayed value is the local probe one LPP Remote pressure probe n the value of pressure probe is read from local probe Y the value of pressure probe is sent via LAN StM Solenoid activation via LAN n not used Y a generic coo...

Page 25: ...s available in the L A N Lan L A N serial address 1 to LSn Identifies the device address inside local network of multiplexed cabinet controller Adr RS485 serial address 1 to 247 Identifies the device address when connected to a MODBUS compatible monitoring system Rel Release software read only Software version of the microprocessor Ptb Parameter table read only it shows the original code of the dI...

Page 26: ...r is always OFF If the nPS activation in the d d time is reached switch the controller OFF and ON to restart normal regulation 9 4 Door Switch Input dor This input signals the door status and the corresponding relay output status through the odc parameter no normal any change Fan Fan OFF CPr Compressor OFF F_C Compressor and fan OFF Since the door is opened after the delay time set through paramet...

Page 27: ...rity depends on the I P parameters CL the digital input is activated by closing the contact and OP the digital input is activated by opening the contact 10 Installation and Mounting The XM679 can operate without any user interface but normal application is with the CX660 keyboard The CX660 keyboard should be mounted on a vertical panel in a 29 mm x 71 mm hole and secured using the special bracket ...

Page 28: ... enables the controller to be linked to a network line that is MODBUS RTU compatible with all monitoring systems 13 How to Use the Hot Key XM controllers can download or upload the parameter list from its own non volatile internal memory to the Hot Key and vice versa through a 5 pin connector The Hot Key will not change the Adr 13 1 Download From the Hotkey to the Device 1 Turn OFF the controller ...

Page 29: ... UPL will blink on the display End will display at the end of the data transfer phase if a successful upload has occurred Err will display if there is an error or failure in programming End correct programming Err failed programming In this case press the SET key if you want to restart the programming again or remove the unprogrammed Hot Key 4 Remove the Hot Key Note The upload procedure will over...

Page 30: ...ged PPF PPF is displayed by slaves of pressure that don t receive the value of pressure The percentage of the valve opening is fixed at PEO value CPF CPF is displayed when the remote probe 4 is not working The percentage of the valve opening is fixed at PEO value TEMPERATURE ALARM HA Maximum temperature alarm Outputs unchanged LA Minimum temperature alarm Outputs unchanged HAd Defrost high tempera...

Page 31: ...ged CLOCK ALARM rtC Clock settings lost Defrost will be performed with ldF until the settings of RTC has been restored rtF Clock damaged Defrost will be performed with ldF OTHERS EE EEPROM failure All outputs OFF Err Error with upload download parameters Repeat the operation End Parameters have been correctly transferred Outputs changed Table 14 1 Alarm Signals Continued Continued ...

Page 32: ...14 2 Alarm Recovery Probe alarms P1 probe1 faulty P2 P3 P4 P5 and P6 automatically stop 10 seconds after the probe restarts normal operation Check connections before replacing the probe Temperature alarms HA LA HAd LAd HAF and LAF automatically stop as soon as the thermostat temperature returns to normal values or when the defrost starts External alarms EAL and bAL stop as soon as the external dig...

Page 33: ... 230VAC with switching power supply Power Absorption 9VA max Inputs Up to 6 NTC PTC Pt1000 probes Digital Inputs Three 3 voltage free Relay Outputs Total current on loads MAX 16A See Section 16 UL Ratings Valve Output a c output up to 30W Only XM679 Optional Output AnOUT Depending on the model PWM Open Collector outputs PWM or 12VDC max 40mA Analog Output 4 to 20mA or 0 to 10V Serial Output RS485 ...

Page 34: ...istive 30k cycles 120 240 V 50 60 Hz C300 Pilot Duty 30k cycles Terminals 14 and 13 Alarm not populated on XM66 series 120 240 V 50 60 Hz 5 A General Purpose 6k cycles 120 240 V 50 60 Hz 3 A Resistive 100k cycles Terminals 1 2 and 3 Pulse Valve not populated on XM66 series 230 V 30 Watt Terminals 4 5 and 6 Temperature Maximum ambient operating temperature 60 C Pollution Degree 2 Normally only non ...

Page 35: ...Technical Service if you have more than 25 devices per COM segment 17 1 1 Wiring Guidelines 17 2 XM670 Wiring Diagram DEVICE TYPE EMERSON ANALOG TEMP SENSOR DIGITAL INPUT BELDEN 8761 22 2 SHIELDED Emerson P N 035 0002 RS 485 NETWORK BELDEN 8761 22 2 SHIELDED Emerson P N 035 0002 BELDEN 8641 24 2 SHIELDED Emerson P N 135 8641 PRESSURE TRANSDUCER BELDEN 8771 22 3 SHIELDED Emerson P N 135 8771 8771 f...

Page 36: ...Supply Terminals 7 8 Valve at 115V Terminals 4 5 17 4 XM679 24VAC Valves Wiring Diagram Figure 17 2 XM679 230VAC Valves Figure 17 3 XM679 24VAC Valves NOTE The jumper labeled as JMP is located inside the case of the controller The JMP jumper should be closed only when driving the 24VAC valve ...

Page 37: ...FACE BOARD PIB 237 4810 Version 1 00 E2 Power Interface Board P I B R Echelon Terminate Up 0V RS485 2B TX1 RX2 RX1 JP4 JP5 JP6 JP1 JP2 JP3 REVERSE POLARITY OF ON RS485 CABLE FROM E2 BELDEN 8641 TYPICAL earth ground connection 100 ohm Watt 1 2 18 17 16 15 14 13 12 10 9 7 8 11 3 2 1 19 20 22 23 24 25 26 39 38 37 36 35 34 33 32 31 30 29 28 27 21 RS485 modbus Black White XM67X Series Shield MODBUS TER...

Page 38: ... Circuit 2 XM679 Address17 XM679 Address18 XM679 Address24 Circuit 3 XM679 AddressXX XM679 AddressXX XM679 AddressXX Circuit X MultiFlex XXX Address02 RS485 MultiFlex XXX Address03 RS485 MultiFlex XXX AddressXX RS485 LAN RS485 LAN RS485 LAN RS485 LAN RS485 LAN RS485 LAN RS485 LAN RS485 LAN RS485 Black White Black White Black White Black White Black White Black White Black White Black White Black W...

Page 39: ...her XM600 device Master device pressure dPP Shows the value of pressure measured by pressure transducer dP5 Shows the temperature value measured by probe 5 Slave device pressure rPP Shows the value of pressure received by remote pressure probe connected to other XM600 device Check for error messages Error message examples dPP Err in the Master device the value of pressure read from the transducer ...

Page 40: ...US address For example a correct configuration would be If the LAN is well connected the green LED will be ON If the green LED blinks then the connection is wrongly configured The maximum distance allowed is 30m 20 3 Sensors for Superheat Control Temperature probe Pb6 terminals 19 20 without any polarity Select the kind of sensor with P6C parameter Pressure transducer Pb5 terminals 21 input of the...

Page 41: ...rity code is correct the access to Pr2 is enabled by pressing SET on the last digit 6 Navigate to the LPP of the Master device the device where the pressure probe is connected and select Y Set the LPP to N for all other slave devices 7 Navigate to tPP of the Master device and set it to PP Pressure Probe The slave devices tPP parameter will be set to LAn 8 Navigate to P5C parameter Pressure Probe w...

Page 42: ...36 XM679K I O Manual 026 1218 Rev 4 21 Wiring Connection to Site Supervisor Figure 21 1 Site Supervisor Wiring ...

Page 43: ...ices Serial tab to enable COM4 or an E2 Expansion COM Card P N 637 4871 to enable COM6 Connect the MODBUS network cable to the three terminal connector on the COM port you wish to assign as MODBUS Reverse polarity of on RS485 cable from E2 to the device 22 2 COM Port Associations E2 Versions 4 0 and Above Figure 22 1 Location of E2 Com Ports E2 PIB Board E2 versions 3 xx and Below E2 PIB COM PORT ...

Page 44: ...eld for all COM ports on the E2 Highlight the COM port connection field that will be used for the device and press LOOK UP From the list of network types select MODBUS 5 Four fields will become visible underneath the COM port connection field which pertain to the way the device communicates Baud Default setting is 19 2k The baud rate setting should be set to match the baud rate of the XM670 XM679 ...

Page 45: ...his device to a different number that is not being used 7 Repeat Steps 5 and 6 until each device has a name and address 8 When finished press to return to the Network Setup menu then press Network Summary Figure 22 7 Locate the devices you set up and look at each device s status in the Status field You will see one of the following messages Online The device is communicating normally Offline The d...

Page 46: ...ance between signal and shield 59 pF ft or less 17 98 m or less Maximum Length 4000 ft 18 to 22 AWG 1219 2 m 2500 ft 24 AWG 762 m Nominal Impedance 120W 50W 22 5 MODBUS Termination Blocks Because the XM670 XM679 device has no on board means of termination use the MODBUS termination block P N 535 2711 for termination that can be wired to the end of the cable segment using the three pin connector Wi...

Page 47: ...FF time with faulty probe 0 to 255 min CF C Pr2 Measurement unit Celsius Fahrenheit C 0 F 1 PrU rE Pr2 Pressure Mode rE 0 Ab 1 PMU bAr Pr2 Pressure measurement unit bAr 0 PSI 1 MPA 2 PMd PrE Pr2 Pressure displaying mode temperature or pressure tEM 0 PrE 1 rES dE Pr2 Resolution only C decimal integer dE 0 in 1 Lod P1 Pr2 Local display default display nP 0 P1 1 P2 2 P3 3 P4 4 P5 5 P6 6 tEr 7 dEF 8 r...

Page 48: ...AR PrM rEL 1 0 to P20 PRM Abs 0 0toP20 PSI PrM rEL 14 to P20 PRM Abs 0toP20 dKP PrM rEL 10 to P20 PRM Abs 0 to P20 P20 11 0 Pr2 Probe value at 20 mA or at 5V BAR PrM rEL PA4 to 50 0 PrM AbS PA4to50 0 PSI PrM rEL PA4 to 725 PrM AbS PA4to725 dKP PrM rEL PA4 to 500 PrM AbS PA4 to 500 LPL 0 5 Pr1 Lower pressure limit for superheat regulation PA4 to P20 MOP 11 0 Pr1 Maximum operating pressure threshold...

Page 49: ...1 Defrost display time out 0 to 255 min Fdt 0 Pr1 Drain down time 0 to 255 min dPo n Pr1 Defrost at start up n 0 Y 1 dAF 0 0 Pr1 Defrost delay after continuous cycle 0 to 24 0 144 hours 10min FAN FPA P2 Pr1 Fan probe A nP 0 P1 1 P2 2 P3 3 P4 4 P5 5 FPb nP Pr1 Fan probe B nP 0 P1 1 P2 2 P3 3 P4 4 P5 5 FPE 100 Pr1 Virtual probe percentage fan management 0 to 100 100 FPA 0 FPb FnC O n Pr1 Fan operati...

Page 50: ... or 55 0 C to dLU dAH 1 0 Pr2 Differential for temperature alarm defrost probe 1 F to 45 F 0 1 C to 25 5 C ddA 15 Pr2 Temperature alarm delay defrost probe 0 to 255 min FLU 150 Pr2 High temperature alarm setting fan probe 0 F to 90 F or FLL to 302 F 0 0 C to 50 0 C or FLL to 150 0 C FLL 55 Pr2 Low temperature alarm setting fan probe 0 F to 90 F or 67 F to FLU F 0 0 C to 50 0 C or 55 0 C to FLU FAH...

Page 51: ...d 30 Pr1 Outputs restart after door open alarm 0 to 255 min CLOCK CbP Y Pr1 Clock presence n 0 Y 1 Hur Pr1 Current hour Min Pr1 Current minutes dAY Pr1 Current day Sun 0 SAt 6 Hd1 nu Pr1 First weekly day Sun 0 SAt 6 nu 7 Hd2 nu Pr1 Second weekly day Sun 0 SAt 6 nu 7 Hd3 nu Pr1 Third weekly day Sun 0 SAt 6 nu 7 ILE 0 0 Pr1 Energy saving cycle start during workdays 0 23 5 143 hours 10min dLE 0 0 Pr1...

Page 52: ... C to 30 0 C PEL n Pr1 Energy saving activation when Light switched off n 0 Y 1 LAN MANAGEMENT LMd y Pr2 Defrost Synchronization n 0 Y 1 dEM y Pr2 Defrost end Synchronization n 0 Y 1 LSP n Pr2 SET POINT Synchronization n 0 Y 1 LdS n Pr2 Display Synchronization temperature sent via LAN n 0 Y 1 LOF n Pr2 ON OFF Synchronization n 0 Y 1 LLi y Pr2 Light Synchronization n 0 Y 1 LAU n Pr2 AUX Synchroniza...

Page 53: ... 0 Ptc 1 ntc 2 PtM 3 o6 0 0 Pr2 P6 calibration 21 F to 21 F 12 0 C to 12 0 C SERVICE CLt Pr1 ON OFF percentage C R O read only tMd Pr1 Time remaining before next defrost activation only for interval defrost read only LSn Pr1 Number of devices in LAN 1 to 8 read only LAn Pr1 List of address of LAN devices 1 to 247 read only OTHER Adr 1 Pr1 MODBUS address 1 to 247 rEL Pr1 Firmware release read only ...

Page 54: ... for E2 Standard and terminated with a 150 ohm resistor at the other end of the network segment 150 ohms between the two communication wires Recommended For reliable communication on some installations it may be necessary to connect a 100 ohm resistor between the XR XM or XEV device s previously identified ground terminal and earth ground Some E2 MODBUS COM Ports Can Support Two Network Segments F...

Page 55: ...Figure 1 MODBUS COM Wiring Diagram MODBUS Termination BlocksAppendix A Alternate MODBUS COM Wiring Method for E2 XR XM and XEV Devic es 49 ...

Page 56: ......

Page 57: ...merson Climate Technologies Retail Solutions Inc and or its affiliates collectively Emerson reserves the right to modify the designs or specifications of such products at any time without notice Emerson does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any product remains solely with the purchaser and end u...

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