HONEYWELL FC-TSAI-1620M

Description

HONEYWELL FC-TSAI-1620M
TSAI-1620m
Safe 0-20 mA and 4-20 mA analog input FTA (16 channels)
Description
Field termination assembly module TSAI-1620m is the interface between field
components (such as sensors) and the safe high-density analog input module
SAI-1620m in Safety Manager. It can be used for interfacing signals from Class I,
Division 2 Hazardous Locations.
The TSAI-1620m module has sixteen analog input channels, which may be used
for both safety-related and non-safety-related applications. These sixteen
channels (separated into two groups of eight channels with common 0 V) are
connected via a system interconnection cable (SICC-0001/Lx), which is plugged
into the SIC connector on the FTA module.
The FTA module has a universal snap-in provision for standard DIN EN rails, and
screw terminals for connection of power supply, ground and field wiring
Main functions
TSAI-1620m module has three main functions:
• Linear direct conversion of 0(4)—20 mA DC field signals to the signal levels
of the safe high-density analog input module SAI-1620m
• Power supply distribution to each transmitter with voltage-current limitation
in compliance with Hazardous Area Class I Division 2
• Enabling monitoring of the external power connected to the FTA module
Linear direct conversion
The input circuit of each channel consists of a high-precision resistor, which
converts the input current (0—20 mA) to the input voltage for the high-density
analog input module SAI-1620m. Power is supplied to the analog transmitter via
a series resistor. Each analog signal has its own terminal for the field cable shield.
Figure 322 on page 536 shows the schematic diagram for connecting a transmitter
(active and passive).
The TSAI-1620m module may be used for non-incendiary field circuits for
Class I, Division 2 applications. The external output voltage (V+) is
current-limited by means of a series resistor.
Transmitter voltage
Figure 323 on page 537 shows the available transmitter voltage for passive
transmitters.
External power
If all inputs are active, no external power is required.
For loops, which contain passive transmitters, analog process data is only
available if the supply voltage to the electronics is guaranteed. The high-density
analog input concept (using TSAI-1620m / TPSU-2430 modules) offers full
monitoring of power that is provided externally. If DC/DC converter modules
TPSU-2430 are used, even redundant power supplies are covered.
Redundant external power can be connected to the TSAI-1620m module via two
screw terminal pairs marked ‘1A’, ‘1B’, ‘2A’ and ‘2B’. The external power
supplies are de-coupled via diodes (see Figure 324 on page 538). The sixteen
channels on the FTA module are divided into two groups of eight channels, with
each group being protected by a 315 mA fuse. Single-channel errors (shorts from
V+ to 0 V) cannot blow the group fuse.