Technical Specifications

FAQ

1. What is the Foxboro FBM202 P0916AC?
The FBM202 is the model designation and P0916AC is the ordering number. This product is a compression terminal assembly designed for use with the Foxboro I/A Series 200 FBM202 thermocouple/mV input module. It provides a structured termination point for field thermocouple and millivolt signal wiring. The terminal assembly is passive and does not perform the primary signal acquisition or analog-to-digital conversion functions handled by the FBM202 module.

2. What types of signals can the P0916AC terminate?
The P0916AC is designed for thermocouple and low-level mV analog signals. It provides the field wiring interface for connecting thermocouple or millivolt signals to the associated FBM202 input module. Because these signals are relatively low level, proper wiring, polarity, terminal tightening, and correct conductor selection are important for maintaining reliable measurement performance.

3. How many input channels does the P0916AC support?
The P0916AC provides termination for eight independent thermocouple/mV input channels when used with the FBM202 system. Each field signal is connected to its corresponding terminal position. During installation, the channel assignments should be checked against the system wiring drawings to ensure that each field instrument is connected to the correct FBM202 input channel.

4. Does the P0916AC provide cold junction compensation?
The termination assembly used with the FBM202 system incorporates a 4-wire 100 Ω platinum RTD conforming to IEC 751 Class B for reference junction temperature measurement and cold junction compensation. Accurate reference junction measurement is important for thermocouple applications, so the RTD wiring and associated terminals should be correctly connected and maintained in good condition.

5. What type of terminals are used on the P0916AC?
The P0916AC uses compression screw terminals and is designed for DIN rail mounting. This arrangement provides a convenient way to organize multiple thermocouple and mV signal connections inside an industrial control cabinet. During wiring, the conductor size should remain within the specified terminal range, and each connection should be tightened securely to minimize contact resistance and intermittent signal problems.

6. How is the P0916AC connected to the FBM202 module?
The P0916AC is mounted on a DIN rail and connects to the FBM202 module through a compatible termination cable. The cable transfers the field input signals between the terminal assembly and the FBM202 module. Depending on the cabinet layout and installation requirements, the termination cable can be routed over an appropriate distance, with the maximum specified cable length reaching 30 m.

7. How should an abnormal thermocouple reading be troubleshot through the P0916AC?
First check the corresponding thermocouple wiring for open circuits, short circuits, reversed polarity, or damaged conductors. Then inspect the P0916AC terminals for loose connections, oxidation, or poor contact. The termination cable should also be checked at both ends. If the field wiring and terminal assembly are functioning correctly, verify the cold junction compensation circuit and the corresponding FBM202 input channel to determine whether the problem originates from the field circuit, terminal assembly, or I/O module.

8. What should be checked when replacing a P0916AC?
Before replacement, verify that the required model is FBM202 with ordering number P0916AC and confirm the existing terminal and cable configuration. Thermocouple circuits are polarity-sensitive, so the original channel assignments and conductor positions should be documented before disconnecting the wiring. After installation, check terminal tightness, thermocouple polarity, termination cable connections, and the reference junction compensation circuit. A channel-by-channel loop test should then be performed to confirm that all eight input channels transmit the expected signals correctly.