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Description
Overview
Essential details：1797-IE8 Flex Ex analog input module
The Allen-Bradley 1797-IE8 is a Flex Ex analog input module. This module features an Intrinsically Safe (IS) input type with ratings of Ex ia IIB/IIC T4 AEx ia IIC T4 Class I, II, III Division 1 Group A-G T4 and Intrinsically Safe module type of Ex ib IIB/IIC T4 AEx ib IIC T4 Class I, II, III Division 1 Groups A-D T4.
The 1797-IE8 has Eight (8) non-isolated, analog input channels. Each channel is individually configured and capable of receiving 0-20 mA and 4-20 mA signals with resolution of 16-bits. It The analog data is internally converted into digital data with configurable data formats. The module has an accuracy of 0.1% of output signal range at 20 °C (68 °F) and Temperature drift of 0.05%/C of output signal range.
The modules has an approximate update rate of 200 ms as the fastest and 1600 µs as the worst update time. This update rate depends greatly on the distance of the module from the communication adapter.
The 1797-IE8 is designed with internal diagnostics, enabling the module to detect alarm situations such as lead breakage detection, overrange/underrange alarms and remote transmitter alarm.
The 1797-IE8 requires an equally rated terminal base. Compatible terminal base includes 1797-TB3 or 1797-TB3S. It cannot be used with standard Flex I/O terminal bases. When establishing I/O connections to the terminal base, recommended wire size is 4mm2 (12 AWG), stranded copper wire. Additionally, the recommended insulation thickness is 1.2 mm (3/64 in.). The module’s keyswitch assignment is position 3.
1797-OB4D
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1797-IE8 Flex Ex analog input module
The 1797-IE8 and -IE8NF modules accept up to 8 analog inputs. The inputs are non-isolated and will accept current in either of the following two ranges: 4-20mA or 0-20mA. The default input range is 0-20mA. The inputs have both fixed hardware filters and selectable firmware digital filters.
Similarly, the 1797-OE8 module provides as many as 8 analog outputs. The outputs are nonisolated and will provide current in either of the following two ranges: 4-20mA or 0-20mA. The default output range is 0-20mA.
Each module offers:
• local microprocessor intelligence for advanced features
• full functionality without switches or jumpers
• multiple data ranges that can be independently programmed in channel groups
• lead breakage detection
• overrange/underrange alarms
• remote transmitter alarm as well as a host of other module features.
FLEX Ex analog I/O modules provide best utility when used with ControlNet Ex products on the ControlNet network. Data connections are established between the I/O module and an Allen-Bradley programmable controller to transfer information between the two at a scheduled rate. Input module information is then automatically made available in the PLC data table through the data connection. Reciprocally, output data information determined by the PLC program is also automatically transferred from the PLC data table to the output module through the data connection. In addition, when the data connection is originally established, configuration information for the module is automatically transferred to it via the network.
