Month: July 2026

Description

The 2551-A is a high-speed 8-channel isolated thermocouple input module de- signed

to be compatible with the CTI 2500 Series® and Simatic® 505 I/O base in local,

remote I/O, and Profibus configurations. The 2551-A translates thermocouple and

millivolt input signals into a scaled temperature value.

Features

 Simatic® 505 I/O base format

 1500 V channel-to-channel isolation

 1500 V channel-to-PLC backplane isolation

 Fast 2 mSec update time per channel

 On-board cold junction compensation for each thermocouple input

 Microprocessor self-diagnostics

Additional Product Information:

On CTI’s Website you will find links to the 2500 Series Standard Environmental Specifications

and the UL Agency Certificates of Compliance.

Specifications

Input Channels: 8 isolated input channels, individually configurable for thermocouple or millivolt input

Thermocouple Types: J or K, jumper selectable for each channel

Millivolt Input: 0 – 55 mV

Digital Filtering Time Constant: 0.3 Sec

Output Units: Degrees C or F,

(jumper selectable for all outputs)

Repeatability: 0.05%

Accuracy: Type J: ±1° from 0° to 760°C

Type K: ±1° from 0° to 1372°C Millivolt: .06 Millivolt

Resolution: 0.3°C, 0.6°F thermocouple input

.020 millivolt input

Common Mode Rejection:

>110db @ 60Hz (digital filtering disabled)

Normal Mode Rejection:

>45db @ 60Hz (digital filtering enabled)

Input ESD Protection: 20.000 V

Overrange Protection: 20 VAC for 1 minute (all input terminals)

Isolation: 1500 VDC channel-to-channel 1500 VDC channel-to-PLC

Connector: Fixed

Wire Gauge: 18-24 AWG

Backplane Power: 2.4 Watts

Module Size: Single-wide

Shipping Weight: 1.5 lb (0.68 Kg)

Description

The 2534 8-Point Form C Relay Output Module provides eight isolated Form C relay outputs

for the CTI 2500 Series® or the SIMATIC® 505 I/O base. This module plugs directly into

the CTI 2500 Series® I/O base and responds to CTI 2500 Series® instructions.

The 2534 is designed for high current applications such as switching motor starters.

It is also designed for 125 VDC (nominal) low level current applications and is especially

suited for applications in power utility substations.

Features

• CTI 2500 Series® base format

• 8 Form C relay outputs

• Isolated 1500 VDC channel-to-backplane

• Wide 15-240 VAC, 15-150 VDC output range

• 4.0 Amps per output

• Individually fused outputs

• Single-wide module

Specifications

Outputs per module: 8

Isolation: 1500 VDC channel-to-backplane

1500 VDC channel-to-channel

Output voltage: 15 – 240 VAC

15 – 150 VDC

Inrush current: 64 Amps for 2 mSec Indicators: 8 individual LEDs Maximum output current:

15VAC – 240VAC: 4A

15VDC – 30VDC: 4A

150VDC: Resistive: 1mA – 500mA Inductive: 1mA – 250mA

Switching rate: 5 ops/sec (no load)

Type of contact: Form C

Type of outputs: Individually fused

Contact life: @ full rated current, 4A = 300.000 cycles @ 2A = 1.000.000 cycles

Backplane Power: 1.0 Watt

User Power Supply: 24VDC +10%

160 mA (all outputs ON)

Fuses: 8. 5 amp, 250V, field replaceable Type Littelfuse #215-005 or Schurter #0001.2511

Connector: 2500-40F sold separately

Wire Gauge: 14 – 22 AWG

Module Size: Single-wide

Shipping Weight: 1.8 lb. (0.82 Kg)

Additional Product Information:

On CTI’s Website you will find links to the 2500 Series Std Environmental Specifications and

the UL Agency Certificates of Compliance .

Description

The 2530 8-Point Relay Contact Module provides eight isolated “Form C” relay outputs

for the CTI 2500 Series® or Simatic® 505 I/O base. The 2530 is designed for high

current applications such as switching motor starters.

The 2530 is also designed for 125 VDC (nominal) low level current applications. 

This module is especially suited for applications in power utility stations.

Features

• 8 individually isolated “Form C” relay outputs

• Up to 4 amps per output

• 1500V channel-to-PLC backplane isolation

• Switches 125 VDC (ideal for power utility substation applications)

• Single-wide module

• CTI 2500 Series® base format

Channel Configuration Explanation

The 2598-8 was designed using a PCB that could also perform as a 16 or 32pt module.

Hence, the PCB printing for channels do not line up with actual 2598-8 channels.

See chart below for the proper correlation of channels.

For example, if the module reported channel 4 was blown, then the user would replace

the fuse marked ‘CH 10’ on the PCB.

Grouping Configuration

The 2598-8 is shipped to allow two channels to be grouped and share a common field

user power, thereby allowing a different user power supply voltage to be used by each

grouping. Jumpers J2. J4. J6. and J8 come set in the “8 common” selection from the

factory and should not be altered for proper module operaton. This setting allows for 

2 points per common operation.

For example, Channels 1-2 will share a common user power and Channels 3-4 will share

another common user power. In this example each group of two channels is isolated

from the other group of two channels. Be-cause each group of two is isolated,

the user may also change the supply voltage for each group.

So, in this example, Chan- nels 1-2 could be 240VAC outputs and Channels 3-4 could

be 120VAC outputs.

Specifications

Outputs per Module: 8

Isolation:

2100 VDC channel-to-backplane

3000 VDC group-to-group

Output Voltage: 11 VAC to 240 VAC

Maximum Output Current:

2.0 Amps max.,

4A per group

16A per module

For Class 1 Div 2 locations:

2A per point @50°C

1.5A per point @ 60°C

Maximum Surge Current: 3 Amps for 15 Sec

“ON” State Voltage Drop: 1.0V @ 1.0 Amp

“OFF” State Leakage Current: 1mA

Turn  On Time: 1 AC cycle

Turn  Off Time: 1 AC cycle

Fuses:

16. 2.5 amp, 250V, Type: Littlefuse #21602.5.

Bussman GDA-2.5 (Field replaceable)

Connector: Removable Part# 2500-40F

Note: The connector is ordered separately.

Wire Gauge: 14 – 22 AWG

Backplane Power: 1.25  Watts max.

Module Size:  Single-wide

Shipping Weight: 1.5 lb. (0.68 Kg)

Description

The 2598 8/16-Point AC Discrete Output Module

provides eight outputs  isolated in groups of 2 from

CTI 2500 Series® or Simatic® 505 I/O bases. The

module utilizes solid-state output circuits  to switch on

or off external devices such as pilot lamps, motor

starters, or solenoids. The 2598-8 is designed to

switch externally supplied 11 to 240 VAC. The internal

logic signals are isolated from the external outputs to

2100 VDC.

Features

• 8 AC output points

• Replaces Siemens® 505-4608. and -4808.

• 3000 VDC group-to-group isolation

• 2100 VDC channel-to-backplane isolation

• Isolation in groups of two

• Wide 11-240 VAC output range

• 2.0 Amps per output

• 16 Amps total module output

• Individually fused outputs

• Sourcing outputs

• Single-wide module

32-Point Mode: 4 Common Configuration

The user may configure the module to allow four channels to be grouped and share a common field user

power, thereby allowing a different user power supply voltage to be used by each grouping. Jumpers J2.

J4. J5. and J6 are used to configure this selection.

For example, if the user places the J2 jumper in the 4 Common position, Channels 1-4 will share a

common user power and Channels 5-8 will share another common user power. In this example each

group of four channels is isolated from the other group of four channels. Because each group of four is

isolated, the user may also change the supply voltage for each group. So, in this example, Channels 1-4

could be 24VDC outputs and Channels 5-8 could be 60VDC outputs. Furthermore, the user may select a

different configuration for J4. J5. or J6. allowing for further combinations of four or eight channels that

share a common.

Specifications

Outputs per Module:  8.16. or 32

Isolation:  2100 VDC channel-to-backplane

3000 VDC group-to-group

Output Voltage: 11 VDC to 125 VDC

Output Source Current per Circuit:

2.0 Amps max., 1 mA min.

Total Module Output Current: 32 Amps max.

from 0o to 60oC

Maximum Surge Current: 3 Amps for 15 Sec

“ON” State Voltage Drop: 0.5V @ 1.0 Amp

“OFF” State Leakage Current: <20µA

Turn On Time: 1 mSec (nominal)

Turn Off Time: 3 mSec (nominal)

Fuses: 32. 2.5 amp, 250V,

Type: Littlefuse #21602.5.

Bussman GDA-2.5 (Field replaceable)

Connector: Removable

Wire Gauge:  14 – 22 AWG

Backplane Power:  1.7 Watts max.

Module Size:  Single-wide

Operating Temperature:  0o to 60oC

(32o to 140oF)

Storage Temperature:  -40o to 85oC

(-40o to 185oF)

Relative Humidity:  5% to 95%

(non-condensing)

Agency Approvals Pending:

UL, ULC, FM (Class 1. Div.2), CE

Shipping Weight:  1.5 lb. (0.68 Kg)

Description

The 2597 8/16/32-Point DC Discrete Output

Module provides eight, sixteen, or thirty-two

sourcing fused outputs from the CTI 2500

Series or Simatic® 505 I/O base. The module

utilizes solid-state output circuits to switch on

or off external devices such as pilot lamps,

motor starters, or solenoids. The 2597 is

designed to switch externally supplied 11-125

VDC. The internal logic signals are isolated

from the external outputs to 2100 VDC.

Features

• 8. 16. or 32 DC output points

• Replaces Siemens®  505-4508. -4516. -4532.

-4708. -4716. -4732

• 3000 VDC group-to-group isolation

• 2100 VDC channel-to-backplane isolation

• Isolation in groups of 4 or 8 (selectable with

32 pt login configuration

• Wide 11-125 VDC output range

• 2A per output, 8A per user power input

• 32 Amps total module output

• Individually sourcing fused outputs