Emerson XEV22D Dokumentacja Pobierz pdf (Strona 27)

Wiring Types ECT MODBUS Networking to E2s • 21

work Setup menu, then press  - Network Sum-

mary (Figure 17-7). 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 device is not communicating, has not

been commissioned, is not functional, or is not pow-

ered up. Verify the device is powered up, wired cor-

rectly, and has the proper network address, baud

rate, and parity.

• Unknown - The device is not communicating or has

not been commissioned. Verify the device is pow-

ered up, wired correctly, and has the proper network

address, baud rate, and parity.

• No Port - No port is set up in the E2 Serial Config-

uration Manager to be a MODBUS port.

• Wrong FW Rev - This message is likely caused by

the device having a firmware version older than the

minimum revision required by E2 for communica-

tion. Replace the device with a new one or a device

that has the latest version of firmware on it.

17.2.Wiring Types

Retail Solutions specifies Belden #8761 shielded

twisted pair cables for use as MODBUS wiring (or

Belden #82761 and Belden #88761 for plenum instal-

lations).

For MODBUS network wiring of XEV series of

controllers to E2, Belden #8641 (CPC P/N 135-8641)

is the recommended wire type to use.

If the recommended cable is not available in your

area, be sure the wiring meets or exceeds the follow-

ing specs:

Figure 17-7 - Network Summary Screen

Shielded? Yes

Conductor Type Twisted Pair

Gauge 18 - 24 AWG

Capacitance between

signal wires

31 pF/ft or less

(9.45 m) or less

Capacitance 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 120±50

1 2 ... 22 23 24 25 26 27 28 29 30

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