UF20 16-Bit Analog Output Modules

Series Part Number

Part Number:	UF20	-	8	AO	-	I	-	16
Explanation:	Platform UF20 - UF20 expansion module platform		Channels 4 - 4 output channels 8 - 8 output channels	Function AO - Analog output		Output Type U - Voltage output; selectable 0-5V, ±5V, 0-10V or ±10V I - Current output; selectable 0-20mA or 4-20mA; both types listed with 4 or 8 channels		Resolution 16 - 16-bit resolution; fixed in this series

Description

Four or eight voltage or current outputs

UF20 analog output modules provide two-wire differential outputs with 16-bit resolution. Choose a U model for configurable unipolar or bipolar voltage signals, or an I model for 0-20mA and 4-20mA signals. Each module occupies 12mm of rail width and uses push-in terminals. The internal system bus supplies 5V; the output circuit also requires a separate external 24V DC supply at A9 and B9.

Model	Outputs	Selectable ranges	Output process data	Typical bus current at 5V
UF20-4AO-U-16	4 voltage channels	0-5V, ±5V, 0-10V, ±10V	8 bytes	48mA
UF20-8AO-U-16	8 voltage channels	0-5V, ±5V, 0-10V, ±10V	16 bytes	56mA
UF20-4AO-I-16	4 current channels	0-20mA, 4-20mA	8 bytes	48mA
UF20-8AO-I-16	8 current channels	0-20mA, 4-20mA	16 bytes	56mA

Output performance and power

Parameter	Voltage models	Current models
Resolution	16 bits
Conversion time	60µs/channel
Accuracy at 25°C	±0.1% of full scale
Accuracy over the full temperature range	±0.5% of full scale
Load	Specified load: 1kΩ	0-600Ω
Output diagnostics	Short-circuit detection	Open-circuit detection
Protection	Overtemperature and overcurrent protection
Signal connection	Two-wire differential output
Isolation	Output channels are not isolated from one another. Power-to-interface and interface-to-bus isolation are provided; magnetic isolation is specified.
Temperature coefficient	<20ppm; the per-degree reference is unspecified

Power parameter	Specification
Internal bus input	5V DC nominal; 4.75-5.25V DC
Bus consumption	48mA typical for four channels; 56mA typical for eight channels, measured at 5V DC
External output supply	24V DC, +20%/-15%; A9 = +24V, B9 = 0V/COM
System-side isolation voltage	500V AC
Reverse-polarity protection	Supported

Terminal assignments and wiring

Use the separate positive and negative terminals for each output. On four-channel versions, terminal pairs 5-8 are unused. Connect cable shields to the grounding arrangement; the module grounding spring contacts the 35mm DIN rail.

Terminal pair	A-side terminal	B-side terminal	Four-channel models	Eight-channel models
1	A1: AO0+	B1: AO0-	Channel 0
2	A2: AO1+	B2: AO1-	Channel 1
3	A3: AO2+	B3: AO2-	Channel 2
4	A4: AO3+	B4: AO3-	Channel 3
5	A5	B5	Unused	AO4+ / AO4-
6	A6	B6		AO5+ / AO5-
7	A7	B7		AO6+ / AO6-
8	A8	B8		AO7+ / AO7-
9	A9: +24V	B9: COM	External output-circuit supply

Wiring parameter	Specification
Terminal type	Screwless push-in
Conductor cross section	0.2-1.5mm²
Separately specified AWG range	22-16AWG
Strip length	8-10mm
Ferrule sleeve length L	10mm

Ferrule	Conductor cross section
E0310	0.3mm²
E0510	0.5mm²
E7510	0.75mm²
E1010	1.0mm²
E1510	1.5mm²

Configuration and output data

Function	Setting or behavior
Channel enable	Independently configurable
Diagnostic reporting	Configurable
Diagnostic detection	Voltage short-circuit detection or current wire-break detection, according to model
Output range	Selectable for the voltage or current model
Stopped-state output setting	Clear the digital output value to zero
Digital configuration envelope	-27648 to 27648; use the nominal code range for the selected signal range below

Each channel occupies two output bytes. Digital zero represents 4mA in the 4-20mA range and 0V or 0mA in the other ranges; a zero digital value must therefore be interpreted using the configured range.

Channel	Byte offsets	Applicable models
0	0-1	All
1	2-3
2	4-5
3	6-7
4	8-9	Eight-channel models
5	10-11
6	12-13
7	14-15

Current range selection and codes

D is the signed digital code and I is current in mA. Nominal conversion formulas apply within the configured range; overflow and underflow entries identify range status.

Selection	Range	Nominal codes	Current from code	Code from current
1	4-20mA	0-27648	I = (D + 6912) × 16 / 27648	D = I × 27648 / 16 - 6912
2	0-20mA	0-27648	I = D × 20 / 27648	D = I × 27648 / 20

Range	Decimal code	Hex code	Current	Status
4-20mA	32767	7FFF	>21mA	Overflow
	29376	72C0	21mA	Overrange
	27649	6C01	20.0006mA	Overrange
	27648	6C00	20mA	Nominal range
	0	0000	4mA	Nominal range
	-1	FFFF	3.9994mA	Underrange
	-692	FD4C	Approximately 3.6mA	Underrange
	-32768	8000	<3.6mA	Underflow
0-20mA	32767	7FFF	>21mA	Overflow
	29030	7166	Approximately 21mA	Overrange
	27649	6C01	20.0007mA	Overrange
	27648	6C00	20mA	Nominal range
	0	0000	0mA	Nominal range
	-1	FFFF	<0mA	Underrange
	-692	FD4C	Unspecified	Underrange
	-32768	8000	Unspecified	Underflow

Voltage range selection and codes

D is the signed digital code and U is voltage in V. The default selection is 0-10V. A dash in the code table indicates that no value is specified for that range and code.

Selection	Range	Nominal codes	Voltage from code	Code from voltage
1, default	0-10V	0-27648	U = D × 10 / 27648	D = U × 27648 / 10
2	±10V	-27648 to 27648	U = D × 20 / 55296	D = U × 55296 / 20
3	0-5V	0-27648	U = D × 5 / 27648	D = U × 27648 / 5
4	±5V	-27648 to 27648	U = D × 10 / 55296	D = U × 55296 / 10

Decimal code	Hex code	0-10V	±10V	0-5V	±5V	Status
32767	7FFF	>10.12V		>5.06V		Overflow
27979	6D4B	≈10.12V		≈5.06V		Overrange
27649	6C01	10.0004V		5.0002V		Overrange
27648	6C00	10V		5V		Nominal range
13824	3600	5V		2.5V
0	0000	0V
-13824	CA00	—	-5V	—	-2.5V
-27648	9400	—	-10V		-5V
-27649	93FF	<0V	-10.0004V		-5.0002V	Underrange
-27979	92B5	—	≈-10.12V		≈-5.06V	Underrange
-32768	8000	—	<-10.12V		<-5.06V	Underflow

Status indicators

Indicator	State	Meaning
Channel 00-03 or 00-07, green	Flashing	Valid output signal
	On	Output signal overrange
	Off	Invalid output signal
STA, red/green	Green flashes at 2.5Hz; red off	Internal bus not started
	Red flashes at 2.5Hz; green off	Internal bus offline
	Green on; red off	Normal operation
	Red and green alternate at 0.5Hz	Upgrade mode
	Red and green flash rapidly together	Firmware upgrade in progress
PR, green	On / off	System power normal / abnormal
Ps, green		Internal field power normal / abnormal
Pf, green		External field power normal / abnormal

Dimensions, installation and operating conditions

Mechanical feature	Specification
Overall dimensions, height × width × depth	105mm × 12mm × 75mm
Mounting	35mm DIN rail
Protection	IP20
Grounding spring	Rail grounding contact
Latch	Secures the module to the rail
Front terminals and LEDs	Signal connections and channel status indication

Open the bottom latch with a screwdriver, position the module on the rail and close the latch before connecting power and signal cables. To remove a module, disconnect its cables, release the latch and remove it along the slot. If installation is difficult, remove the module and check for obstructions before trying again; do not force it into place.

Environmental parameter	Specification
Operating temperature	-20°C to 60°C
Storage temperature	-20°C to 60°C
Operating humidity	<95%RH, non-condensing
Storage humidity	<90%RH, non-condensing
Atmosphere	Free of corrosive gases
Altitude	Below 2000m; 80kPa reference
Pollution degree	2
Overvoltage category	II
Electrical fast-transient immunity	2kV on power lines; IEC 61000-4-4
EMC immunity class	Zone B; IEC 61131-2
Vibration	IEC 60068-2-6: 5-8.4Hz at 3.5mm amplitude; 8.4-150Hz at 9.8m/s²; X, Y and Z axes, 100 minutes per axis in ten 10-minute cycles
Shock	IEC 60068-2-27: 9.8m/s², 11ms; three shocks in each of six directions across three axes

Choose the exact UF20 model for the required signal and channel count, then check the 5V bus budget, external 24V supply and output load. Model-specific specification and installation documents are available as attachments.