ADM51-2/CE1

The Yokogawa ADM51-2/CE1 is a contact output module in Yokogawa's digital I/O product range. It provides transistor-based discrete output functions for switching external control signals. The ADM51 series supports status, pulse and time-proportional output modes. The -2 configuration is associated with output hold behavior during online maintenance, subject to the selected output mode.

Output Functions

The module supports several output operating modes:

• Status output: Maintains ON/OFF states according to control-system commands.
• Pulse output: Generates pulses for discrete control operations.
• Pulse-width output: Provides one-shot pulse output with a configurable pulse width.
• Time-proportional ON/OFF output: Controls ON/OFF duration according to the configured time proportion.

The pulse-width setting ranges from 0.1 to 7200 s, with a resolution of 20 ms. These functions allow the DCS to issue discrete switching commands and timed output signals through the same module type.

Online Maintenance Behavior

The -2 suffix specifies hold action during online maintenance, rather than the reset action associated with the -1 configuration. There is an important operating limitation: ADM51-2 output hold behavior applies to status output mode only. This distinction should be considered when configuring pulse-based or time-proportional applications.

Technical Specifications

Parameter	Specification
Model	ADM51-2/CE1
Brand	Yokogawa
Product Type	Digital Transistor Contact Output Module
Number of Output Points	16 points
Output Signal	Transistor contact
Contact Rating	30 V DC, 100 mA or less
Load Type	Resistive / Inductive
Pulse Width Range	0.1 to 7200 s
Pulse Width Resolution	20 ms
Current Consumption	600 mA or less at 5.0 V DC
Output Functions	Status, pulse, pulse-width and time-proportional ON/OFF
Signal Insulation	Individual point insulation
Mounting	Yokogawa I/O module nest
EMC	/CE1 option for EMC standards compliance

Signal Connection and Configuration

The ADM51 digital output family is available in terminal-type and connector-type configurations. The terminal-type modules connect to the I/O module nest through M4 screw terminals, while connector-type versions use dedicated KS-series cables.

The exact terminal or connector configuration must be confirmed against the complete module designation. The abbreviated ordering reference ADM51-2/CE1 does not identify the T or C hardware suffix shown in Yokogawa's technical specifications.

Frequently Asked Questions

Q: What is the difference between ADM51-1 and ADM51-2?

A: The -1 version uses reset action during online maintenance, whereas the -2 version uses hold action. For the -2 configuration, output holding applies only when the module operates in status output mode.

Q: Can the ADM51-2/CE1 generate timed output pulses?

A: Yes. The ADM51 digital output specifications include pulse output and one-shot pulse-width output functions. The configurable pulse width is 0.1 to 7200 s, with 20 ms resolution.

Q: What does the /CE1 option indicate?

A: Yokogawa identifies /CE1 as the option code for EMC standards compliance in the digital I/O module specifications. It should not be interpreted as a separate output function.

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