Emerson operation manual 18 E2 RX/BX/CX I&O Manual Rev 4 5-JAN-2013

6

1.Connect the 4AO board to the RS485 I/O Network.

2.Set the network address on the first five

rockers of dip switch S1.

3.Set the network baud rate using rockers 6 and 7 of dip switch S1.

4.If the E2 is the beginning of all RS-485 I/O or MODBUS Networks, set all three jumpersto the UP position. For MODBUS, set thejumpers in the top-most position (MOD). ForI/O Net, set the jumpers in the middle position(I/O). For no termination, set the jumpers tothe DOWN position (NO).

5.Optionally, connect the 4-20mA outputs in either a 2-wire

or 4-wire hookup as illustrated in Step 5, or if a 4-20mA is not used, it may be left unconnected.

6.Connect board to the 24VAC center-tappedsecondary of the power transformer.

CAUTION: If you change any dip switch	VIN+
settings while the board is powered, disconnect
the power and re-power the board to reset.		15-K
NOTE: The voltage divide function capability
on the previous model (P/N 810-3030) 4AO board is				VOUT +
no longer supported. This can now be accomplished		15-K
by using two external 15-K resistors. If used with E2,
scale output range.	-		-

SHIELDED TWISTED PAIR	BAUD RATE
BELDEN #8761. FOR PLENUM,
USE BELDEN #82761 OR #88761
OR EQUIV.

NET

I/O

WIRE + to + (same color)

WIRE 0V to 0V

WIRE - to - (same color)

MOD [	MOD[	MOD[
I/O [	I/O [		I/O	[
NO [	NO [		NO	[
NOT TERMINATED	TERMINATED			TERMINATED						(Term)
	FOR I/O NET		FOR MODBUS NET				(Term)
4-20mA	“2-wire” 4-20mA						4-20mA			“4-wire” 4-20mA
	(Externally Powered)						Analog			(Internally Powered)
Analog	Hookup example.						Output			Hookup example.
Output	(Isolated)				+		+12V	Jumper		(Not Isolated)
+12V	Not Used		24V
					_		+4-20
+4-20	+								+
4-20 OUT	_						4-20 OUT			250 ohms	-5V
							0V		_
0V	Not Used					Note:
						Either the “2-wire” or “4-wire”
	250 ohms		1-5V			Hookup may be used at either				Grounded
						4-20mA output. The Hookups may

be the same or different. If a 4-20mA

is not used, it may be left unconnected.

6 WIRING FOR 640-0056, 56VA Transformer, and 640-0080, 80VA Transformer

24VAC Center-Tapped Transformer

Power Wiring Types:

14 AWG	Belden 9495
18 AWG	Belden 9493

120/208/240 VAC

L2	(HOT)	(NEUTRAL)
		L1

240	208	C
		120

Three-conductor non-shielded cables are the recommended wire

for connecting between the center-tapped transformer and I/O boards.

AC1 0V AC2

24V CT 24V

AC1

0V

AC2

PRIMARY SIDE SECONDARY SIDE

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