Emerson Process Management ControlWave XFC - Manual (Page 62)

2-20 / Installation & Operation CI-ControlWave XFC
2.3.3.4.1 Analog Input Configurations
Analog Input circuitry supports inputs from 1-5V devices. Field wiring assignments are
provided in Figure 2-10.
Note:
Cable shields associated with AI wiring should be connected to the ControlWave
XFC’s Chassis Ground Post on the Terminal Plate (#14 AWG wire size Max.) (2
Ground Posts are provided). Multiple shield terminations will require a user
supplied copper ground bus. This ground bus must be connected to the
ControlWave XFC’s Chassis Ground Lug (using up to a #4 AWG wire size) and
must accommodate a connection to a known good Earth Ground (in lieu of a
direct connection from a Terminal Plate Ground Post) and to all AI cable shields.
Shield wires should use an appropriate Terminal Lug and should be secured to
the copper bus via industry rugged hardware (screw/bolt, lock washer and nuts).
2.3.3.5 Non-isolated Analog Output Connector Block J4 (see Figure 2-10)
ControlWave XFCs contain field interface circuitry for one Analog Output that is
configured for 4-20mA sink operation. Field power source can be from the ControlWave
XFC or an external 11 to 30Vdc power source. The +V source tracks the unregulated supply
voltage to 15V and is current limited to approximately 80mA. Analog Output circuit
consists of a 16-bit resolution Digital to Analog Converter (DAC), and a V to I circuit. The
16-bit DAC drives the V to I circuitry.
2.3.3.5.1 Analog Output Configurations
The Analog Output circuitry supports 4-20mA devices. The maximum external load that
can be connected to the 4-20mA output is 450 ohms (with an external 11V power source) or
1000 ohms (with an external 24V power Source). AO operation requires either an 11 to
30Vdc power source connected to the 4 to 20 mA device and grounded to the AO ground
terminal or the XFC furnished +V supply.
2.3.3.6 Non-isolated High Speed Counter Input Connector J5 (see Figure 2-10)
Non-isolated High Speed Counter Input (HSC) circuitry supports a total of 2 inputs
provided with surge suppression bandwidth limiting and 20 microsecond (50kHz) filtering.
In addition, HSCI circuitry contains conditioning circuitry that limits the maximum
frequency of an input signal to 10kHz. Two-wire HSC inputs are internally sourced and
don’t support contact debounce functionality. HSC circuitry is supported by the 12-point
Terminal Block Assembly (J5) on the Terminal Plate. These may also be used as discrete
inputs (DIs).
Field inputs are from driven signals. Each HSC input is configured as a 16-bit high-speed
counter.
2.3.3.6.1 High Speed Counter Configurations
HSC Modules provide a total of 2 HSC inputs with surge protection. Field wiring
assignments are provided in Figure 2-10.