The T8800 Digital Input Field Termination Assembly (FTA) provides
termination for up to 40 input channels from various field devices
that generate digital inputs. The field supply is derived from dual
24 V DC feeds, which are commoned via diodes on the FTA. A green
LED indicates the presence of the power supply, which is then
distributed to each channel. The supply to the field is limited by
a 50 mA fuse, protecting the field loop from overcurrent.
Digital signals from the field devices are fed directly to the
digital input module. Line monitoring components, if required,
provide thresholds to detect the status of the field loop or
device, such as open/short circuits or alarms. The FTA ensures
reliable signal conditioning and protection for the connected input
module.
The 40-channel connection between the input module and the FTA is
terminated at the 96-way socket SK1. SmartSlot (Version 1) signals
from the module are connected via SK1, while the SmartSlot
connector SK2 (also a 96-way socket) is not used in SmartSlot
Version 2 systems. Dual DC field power supplies connect to the FTA
through a 5-way terminal block (PWR TB), and the 40 field input
signals are connected via 2-wire arrangements terminated on twelve
3-way terminal blocks and two 2-way terminal blocks.
| Specification Parameter | Technical Rating / Value |
|---|
| Voltage Range | 18 Vdc to 32 Vdc |
| Fuses | 40-off 50 mA |
| Maximum Current (Field Supply) | 10 mA |
| Power Consumption (Field Supply) | 0.25 W |
| Operating Temperature | 0 °C to +60 °C (+32 °F to +140 °F) |
| Non-operating Temperature | -25 °C to +70 °C (-13 °F to +158 °F) |
| Relative Humidity Range (Operating, Storage, and Transport) | 10% - 95%, non-condensing |
Key Features
- Supports 40 input channels per FTA
- Compatible with industry standard 2-wire field device connections
- Standard DIN rail mounting for easy integration
- Simple installation and connection procedures
- Operates at 24 V DC
- SmartSlot connection enables "one-to-many" hot replacement of input
modules
- Fused field power supply for each channel
- On-board LED indicates the integrity of the field power supply
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