AI-917-00

The Yokogawa AI-917-00 is a four-channel analogue input module designed for the ProSafe-SLS safety instrumented system. It accepts mixed current and voltage signals, with two 0-20 mA inputs and two 0-10 V inputs. The module also provides four logic pulse outputs and programmable processing functions for safety-related signal monitoring and alarm logic.

Input Configuration and Signal Processing

The AI-917-00 combines two analogue signal types on one board, allowing current and voltage signals to be acquired without using separate input modules for each signal type.

• Channels 1-2: 0-20 mA current inputs.
• Channels 3-4: 0-10 V voltage inputs.
• All analogue inputs share a common 0 V reference.
• Current input resistance: 50 Ohm.
• Voltage input resistance: 5.5 kOhm.

The current input has a maximum permissible input of 50 mA, while the voltage input has a maximum of 30 V. These maximum values are input limits, not alternative normal operating ranges.

Programmable Functions and Indication

The module is programmable, and its actual functionality depends on the application program loaded into the board. The front-panel LCD can display input values and application parameters such as setpoints, hysteresis and time delays. LED indicators and push buttons provide application-dependent status and display control.

The module has four logic pulse outputs and two independent processors. Its integrated output AND-gate functions can be used to form alarm groups. The application program determines the use of the available processing and indication functions.

Technical Specifications

Parameter	Specification
Model	AI-917-00
Brand	Yokogawa
Product Type	Analogue Input Module
System	ProSafe-SLS
Number of Analogue Inputs	4
Number of Logic Pulse Outputs	4
Current Input Channels	2 x 0-20 mA
Voltage Input Channels	2 x 0-10 V
Current Input Resistance	50 Ohm
Voltage Input Resistance	5.5 kOhm
Maximum Current Input	50 mA
Maximum Voltage Input	30 V
Input Accuracy	+/- 0.2% +/- 1 bit
Resolution	10 bits, 1024 points
Stability Error	Less than 0.1% / 10 deg C
Field Supply	18-30 VDC
Field Supply Current	70 mA at 24 V
Logic Supply	20 VDC, 10 mA
Power Dissipation	2 W
Analogue Circuit Isolation	0.5 kV (test)
Program Cycle	40 ms, program dependent
Start-up Time	8 s
Propagation Delay	Programmable
Communication Interface	RS-232, programming only
Display	Programmable 2-row LCD
Output Logic Pulse Capacity	500 mA current pulses, 10 unit loads
Data Output	8-bit serial data, 0/11 V
Clock Input	MC-573 clock pulses, 0/11 V
LED Test	18-30 V / 3.5-6 mA
Dimensions	160 x 100 x 20 mm
Mounting Format	Single Euro format, 4TE
Connector	DIN 41612, Type F, 48-pin
Operating Temperature	-10 to +60 deg C
Storage Temperature	-25 to +85 deg C
Relative Humidity	Maximum 75%, non-condensing
EMC	EN 61000-6-2 Immunity; EN 61000-6-4 Emission
Shock Resistance	15 g, 11 ms
Vibration	10-55 Hz, 0.075 mm; 57-150 Hz, 1 g

Rack Connection and Programming

The AI-917-00 uses a 48-pin DIN 41612 Type F connector in a single Euro 4TE format. Its shift-register circuit provides the connection to the system communication structure, while the MC-573 supplies the required clock pulses.

The RS-232 interface is intended for programming rather than general-purpose process communication. An adapter cable is required. The application program and its version can be identified through the front LCD and CPU labels.

Fault Indication and Configuration

The module uses two independent processors to support fail-safe operation. When a module fault is detected, all five front-panel LEDs blink, the four pulse outputs are disabled to logic 0, and a fault code appears on the LCD.

Three programmable switches and several jumper positions control specific operating functions. For example, jumper X5 determines whether pushbuttons 2 and 3 are enabled or disabled. Jumper X12 controls the availability of shift-register bits 1-4. These settings should be checked against the installed application configuration before maintenance work.

Frequently Asked Questions

Q: Can the AI-917-00 accept both current and voltage signals simultaneously?

A: Yes. It provides two 0-20 mA channels and two 0-10 V channels. All four analogue inputs share a common 0 V reference.

Q: Can the AI-917-00 be programmed through its RS-232 interface?

A: Yes. The RS-232 interface is provided for programming and requires an adapter cable. It is not specified as a general-purpose process communication interface.

Q: What happens when the AI-917-00 detects an internal module fault?

A: All five front-panel LEDs blink, the four logic pulse outputs are disabled, and a fault code is displayed on the LCD. The displayed code helps distinguish input discrepancies, communication errors, processor faults and other detected problems. 

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