GE 8140-DI-AC 16-channel Digital Input, 115VAC isolated, sinking

Tradeoff of Resolution for Module Throughput

The module offers ~15 bit effective resolution on all

channels. The module also offers several analog-to

digital conversion options that allow higher speed

signals to be selectively read more quickly on a

channel-by-channel basis.

Note however, that at the highest speeds, uncertainty

in value of the lower bits will increase, resulting in

reduced resolution. The following table indicates the

approximate effect on resolution of higher speeds.

PAC8000 Process Controllers

The PAC8000 Controllers include a Process Controller featuring distributed control system (DCS)- style function block programming; 

a Logic Controller featuring 61131-style programmable logic controller (PLC) programming; 

and a Hybrid Controller that provides both programming styles in the same unit. 

A SIL 2 SafetyNet Controller and an RTU Controller are also available, which provides DNP3 communication for the PAC8000 family. 

The 8521-EB-MT Bus Interface Module, for remote I/O applications, shares the same hardware as the controllers listed below. 

It can be upgraded from a bus interface module to a full controller by firmware download, which is especially useful in ongoing legacy system replacement. 

• 8 isolated, universal, input channels

• Configurable on a channel by channel basis: 4-20mA, THC, RTD, resistance &voltage

• 250V ac rms channel to channel isolation

• Thermocouple types B, E, J, K, N, R, S, T, W3. W5. Russian K, Russian L

• RTD Types Pt100. jPt100. Pt200. Pt500.Ni120. Cu10

• Volt input types ±120mV, 0-1V, 0-5V,1-5V, 0-10V, ±10V

• 2 or 3-wire RTDs

• 2 or 4-wire transmitters

• Non-incendive field circuits

• 24 V dc bussed field power required

CONFIGURABLE PARAMETERS

Sensor type

• User selectable

Alarms

• High-high, high, low and low-low

Alarm deadband (hysteresis)

• User defined value

Input dead zone

• User defined value

Channel status

• Active / inactive

Filter/sample rates

• User selectable

Ease of Use 

A range of features are provided to simplify the day-to-day operation of a Process Automation System: 

– Controllers feature numerous LEDs to assist with fault finding. 

– Controllers report failed power supplies when used in conjunction with PAC8000 AC power supplies and the 8410-NS-PS nodes services module. 

– On replacing an IO module, the Controller will automatically bring it online if it recognizes the type as being correct. 

– Online download of new application programs is possible with simplex controllers, and online download of new firmware is often possible with redundant controllers. 

– PAC8000 controllers feature an RS485 serial connection for Modbus RTU communication (a second serial connection can be made on the Controller Carrier). 

– When used with the dedicated AC Power Supplies, PAC8000 nodes can be configured to “warm start” after power failure 

– the power supplies provide sufficient hold up time for the controller to store all necessary live data and to re-commence control from the point the power was lost, when it is restored.