Category: Industry Trends

CHARM Keying Posts

The Terminal Blocks contain keying posts that are

automatically set and locked to the unique position of

the installed CHARM. The keys prevent the insertion of an

incorrect CHARM during maintenance activities. They are

shipped in a neutral position and are set when a CHARM is

inserted. If needed, the keys can be manually reset to allow

a channel to be re-tasked for a different signal type.

The keying mechanism consists of two keying posts that

rotate and lock into the terminal block base. Each CHARM

type is assigned a unique key setting.

Numatics 580 CHARM Node

The 580 CHARM node enables Easy solenoid valve

integration into DeltaV with Electronic Marshalling. The

new 580 CHARM node connects directly to the CIOC via

redundant CHARM Baseplate extender cables. DeltaV can

autosense the I/O as DO Solenoid Valve CHARMs the same

way as any other CHARM is autosensed in DeltaV.

Benefits of the new 580 CHARM Node include:

Redundant communications and power connections to

pneumatic valve manifolds.

Eliminates the need for additional dedicated networks

like Profibus-DP and simplifies system I/O mapping.

Expands the Electronic Marshalling I/O offering to include

ASCO Numatics pilot valve manifolds, enhancing the

concept of: “I/O Anywhere”.

Reduces programming and commissioning

time dramatically.

Numatics 580 CHARM Node

The 580 CHARM node enables Easy solenoid valve

integration into DeltaV with Electronic Marshalling. The

new 580 CHARM node connects directly to the CIOC via

redundant CHARM Baseplate extender cables. DeltaV can

autosense the I/O as DO Solenoid Valve CHARMs the same

way as any other CHARM is autosensed in DeltaV.

Benefits of the new 580 CHARM Node include:

Redundant communications and power connections to

pneumatic valve manifolds.

Eliminates the need for additional dedicated networks

like Profibus-DP and simplifies system I/O mapping.

Expands the Electronic Marshalling I/O offering to include

ASCO Numatics pilot valve manifolds, enhancing the

concept of: “I/O Anywhere”.

Reduces programming and commissioning

time dramatically.

The Relay Output Terminal Block is designed for high

output current applications and requires the DO 24V DC

High-side CHARM to drive the relay coil. The Relay Output

Term blocks provide a normally open and normally closed

contact with the following ratings:

• 28.8V DC at 5 A switching current

• 48V DC at 0.4 A switching current

• 110V DC at 0.2 A switching current

• 250V AC at 5 A switching current

The Thermocouple / mV Terminal Block is specially

designed for the usage with the Thermocouple / mV

CHARM. The Thermocouple / mV Terminal Block has fixed

key positions to prevent a mismatch in the field and can

only be ordered as an Assembly with the Thermocouple /

mV CHARM.

The 3-wire AI Fused Injected Power Terminal Block

is designed for 3 wire analog transmitters and can be

used with the AI 4-20mA HART CHARM. The field power is

supplied from the injected power bus on the baseplate,

but the power is not removed from the field device when

the AI CHARM is removed from the baseplate. There is

a Green LED on the terminal block that indicated power

is supplied to the field and the 2A fuse also functions

as a means to disconnect power from the field device.

Although this terminal block was introduced in 2017. it

is backwards compatible to any version of DeltaV with

Electronic Marshalling.

Although any signal type can be installed in any location on

the CHARM baseplates, it is recommended that AC voltage

circuits be separated from low voltage signals to comply

with safety recommendations and to mitigate induced noise

in the signals. Standard Terminal blocks, Fused Injected

Power terminal blocks and Relay Output Blocks can be used

on the same carrier, typically, to allow the use of DO 24V

DC isolated CHARMs on higher wattage and 3-wire devices

alongside of standard 24V DC instrumentation signals or

relay contacts.

The Fused-Injected-Power Terminal block, the 3-wire

DI Fused-Injected-Power Terminal block, and the 3-wire

AI Fused Injected Terminal block includes a 2A field

replaceable fuse. The 3-wire DI Fused-Injected-Power

Terminal block is designed to be used with all isolated

discrete Input CHARM types, while the Fused Injected

Power Terminal block is designed to work with all Isolated

discrete Output CHARM types, the 3-wire AI Fused

Injected Power Terminal block is used with AI 4-20mA

HART CHARM type creating a system-powered circuit that

can deliver up to 1 amp (DC) to the field.

Each baseplate has a local power bus that can be

connected to 24V DC or 120/230V AC through the injected

power input terminals, located on the Address Plug

terminal block. Both, the fused-injected power Terminal

Block, the 3-wire DI fused- injected power Terminal Block,

and the 3-wire AI Fused Injected Terminal block connect to

this power bus to provide system power to the field circuit

through the isolated CHARM. You can combine isolated and

system powered circuits on the same baseplate, however, all

system powered channels on a baseplate share the same power source.

I/O Terminal Block Options

• There are six different I/O terminal blocks available to

meet the wiring needs of field signals

• Standard Terminal Block

• Fused-Injected-Power Terminal Block

• 3-wire DI Fused Injected-Power Terminal Block

• Relay Output Terminal Block

• Thermocouple / mV Terminal Block

• 3-wire AI Fused Injected Power Terminal Block

The Standard Terminal block can be used with all CHARM

types. For traditional wiring of field instrumentation,

the CHARMs provide loop power through the internally

distributed 24V DC field power. Refer to specific CHARM

specifications for wiring information.

CHARMs can be partially ejected to a locked position that

disconnects the field wiring from the system to perform

field maintenance actions or to remove power to a field

device. Activating the CHARM latch ejects the CHARM to the

detent position. Closing the latch locks the CHARM in place

and isolates the field wiring for field work.

Baseplate extenders and cables provide great flexibility to

the CHARM installation in existing cabinets or in custom

enclosures. Cables are redundant, each carrying 24V

DC field power, 6.3V DC CHARM power, and one of the

communication busses.

Bus termination provides added robustness for the

communication bus and is installed at the end of the

physical bus.

Label features are available to identify channel usage and

Baseplate identification to help with maintenance.

CHARMs can be added to any existing baseplate

position and autosensed online. Additional CIOCs can be

added online.