Rockwell-automation T8844 Trusted 40 Channel Analogue Input Versatile Manual de usuario descargar pdf (Pagina 7)

Trusted

Analogue Input Versatile FTA T8844

Issue 4 Sep 05 PD-T8844 7

1. Description

The Trusted

40 Channel Analogue Input Versatile FTA T8844 provides termination for a maximum of

0 input channels from various types of field devices which generate an analogue signal in the range of

0-20mA. The 40 channels are arranged in five power groups each comprising eight identical channels.

Figure 2 below shows the configuration of a single channel within a group.

Figure 2 Single Channel Schematic

Each power group is supplied from dual 24V dc feed which are ‘commoned’ via diodes on the VFTA.

The supply is then fed to each channel within the group

The supply voltage to the field is fed via the 315mA fuse. The incoming signal (0-20mA) from the field

device is fed through the 50mA fuse which effectively limits the input signal. The voltage developed

across the 250R resistor (high precision 0.1%) is used by the input module to detect the field device

status.

The cable linking the 40 channels on the input module to the VFTA is terminated at five 10-way

connectors (TBG1 to TBG5). SmartSlot signals from the module are connected to a single 7-way

connector (TBGSS). The dual 24V dc power supplies are connected to the VFTA via five 4-way

connectors (TBFP1 to TBFP5). Forty 3-way connectors are used for the field loops (TB1 to TB40).

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Rockwell-automation T8844 Trusted 40 Channel Analogue Input Versatile Manual de usuario Pagina 7