Field Wire Conversion Module for Modicon B875-111 to 1756-IF16
in Differential Current of Differential Voltage Mode
(Cat 1492-CM800-LA001)
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I. Module Description
The 1492-CM800-LA001 conversion module provides field wire signal conversion from a Modicon® B875-111,
analog, 8-channel, differential current or voltage input module to a ControLogix 1756-IF16, analog, 8-channel, differential current or voltage input module. The conversion module provides the mating connections to the B875-111
swing-arm (terminal block) with the attached field wires. It routes those signals, via its 25-pin, D-shell connector and
a 1492-ACABLEUC or 1492-ACABLEUD pre-wired cable to the compatible terminals of the 1756-IF16 (refer to
the Wiring Diagrams on pages 2 and 3).
25-Pin D-Shell Connector for 1492-ACABLEUC or ACABLEUD
Mating Connector for
B800 Terminal Block
1492-CM800-LA001 Conversion Module
WARNING
De-energize and lockout any and all power to all I/O field devices connected to the Modicon 800 I/O
housing, and the power to the 800 I/O housing itself. Ensure all power is de-energized and locked out to
any device in the control cabinet where the conversion is to be performed. Ensure work is performed by
qualified personnel.
II. Module Installation
The 1492-CM800-LA001 conversion module must be installed in a 1492 conversion base-plate and cover-plate
assembly. The installation of the module into the assembly is explained in the Installation Manual that ships with the
conversion assembly. For a list of compatible assemblies refer to Appendix A.
III. Conversion Module Compatibility Matrix
Conversion Module
1492-CM800-LA001
1492-CM800-LA001
Compatible 800
Input Module
B875-111 (Diff-V)
B875-111 (Diff-C)
Compatible 1756
Input Module
1756-IF16 (Diff-V)
1756-IF16 (Diff-C)
Required 1492 Cable
1492-ACABLEUC
1492-ACABLEUD
This is the cable length in meters and tenths of meters (e.g. 015 = 1.5 meters). Recommended cable
length is 003 (00.3 meters).
10000021823 (Version 00)
Printed in Germany
IV. Conversion Module Wiring Diagram
The following diagrams show the connections from the existing B875-111 swing-arm, through the conversion module,
1492 cable and to the 1756-IF16 analog input module. The diagrams can be used as an aid in possible system troubleWARNING
There are several key application considerations and system specifications (bottom of drawing) when
using these components (conversion module, cable and output module). Read and understand these
considerations before installation.
Conversion: B875-111 to 1756-IF16 (Differential Current) with 1492-CM800-LA001
1492-CM800-LA001
+
-
Current Input 1
Input 1+
Input 1Current Input 2
Input 2+
Input 2Current Input 3
Input 3+
Input 3Current Input 4
Input 4+
Input 4Current Input 5
Input 5+
Input 5Current Input 6
Input 6+
Input 6Current Input 7
Input 7+
Input 7Current Input 8
Input 8+
Input 8Shield 1
Shield 2
Shield 3
Shield 4
Shield 5
Shield 6
Shield 7
Shield 8
Case Ground
Case Ground
Not Used
Not Used
Not Used
Not Used
Voltage Reference +
Voltage Reference -
2
3
4
6
7
8
10
11
12
14
15
16
22
23
24
26
27
28
30
31
32
34
35
36
5
9
13
17
25
29
33
37
1
40
18
19
20
21
38
39
1492-ACABLE003UD
3
2
1
14
15
16
17
18
4
6
8
10
19
Red
12
13
25
24
23
22
20
21
Yellow
1756-IF16
2
4
6
8
12
14
16
18
10
1
5
11
15
Black
White
Black
Green
Black
Blue
Black
Red
Green
Black
Brown
Black
Orange
Black
Red
White
SH
20
22
24
26
30
32
34
36
19
23
29
33
IN-0
IN-1
IN-2
IN-3
IN-4
IN-5
IN-6
IN-7
RTN
iRTN-0
iRTN-2
iRTN-4
iRTN-6
IN-8
IN-9
IN-10
IN-11
IN-12
IN-13
IN-14
IN-15
iRTN-8
iRTN-10
iRTN-12
iRTN-14
B875-111 Swing Arm
Conversion Module Installation and Application Considerations
The B875-111 indicated differential inputs. When it was configured for single ended inputs, it was referred to as a B877-111.
SHIELD GROUNDING: For differential current analog inputs the B875-111 recommended grounding the field wiring shield at the B875-111 module. The
1492 conversion module accounts for this shield ground connection. The pre-wired cable used between the 1492-CM800-LA001 and the 1756-IF16 [1492ACABLE003UD] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected.
The B875-111 recommended placing jumpers from UNUSED to USED analog input channels. These jumpers MUST be removed or they will result in
improper operation.
The B75-111 analog input ranges were configured by DIP switches on the module. The appropriate range for the 1756-IF16 is configured by software.
This design assumes that all inputs on the B875-111 were connected to current transmitters. If there was a mix of current and voltage transmitters,
then modification of the pre-wired cable [1492-ACABLE003UD] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation
Manual for modification details.
CASE GROUND: If connected, remove this wire from the B875-111 terminal block, as it serves no purpose for the 1756-IF16.
Refer to your B875-111 and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features, and
[Reference Doc: 41170-763 (Version 03)]
configuration details.
10000021823 (Version 00)
(2)
IV. Conversion Module Wiring Diagram (Continued)
There are several key application considerations and system specifications (bottom of drawing) when
using these components (conversion module, cable and output module). Read and understand these
considerations before installation.
WARNING
Conversion: B875-111 to 1756-IF16 (Differential Voltage) with 1492-CM800-LA001
1492-CM800-LA001
+
-
Current Input 1
Input 1+
Input 1Current Input 2
Input 2+
Input 2Current Input 3
Input 3+
Input 3Current Input 4
Input 4+
Input 4Current Input 5
Input 5+
Input 5Current Input 6
Input 6+
Input 6Current Input 7
Input 7+
Input 7Current Input 8
Input 8+
Input 8Shield 1
Shield 2
Shield 3
Shield 4
Shield 5
Shield 6
Shield 7
Shield 8
Case Ground
Case Ground
Not Used
Not Used
Not Used
Not Used
Voltage Reference +
Voltage Reference -
1492-ACABLE003UC
2
3
4
6
7
8
10
11
12
14
15
16
22
23
24
26
27
28
30
31
32
34
35
36
5
9
13
17
25
29
33
37
1
40
18
19
20
21
38
39
3
2
1
14
15
16
17
18
4
6
8
10
19
Red
12
13
25
24
23
22
20
21
Yellow
1756-IF16
2
4
6
8
12
14
16
18
10
Black
White
Black
Green
Black
Blue
Black
Red
IN-0
IN-1
IN-2
IN-3
IN-4
IN-5
IN-6
IN-7
RTN
Green
20
22
24
26
30
32
34
36
Black
Brown
Black
Orange
Black
Red
White
SH
IN-8
IN-9
IN-10
IN-11
IN-12
IN-13
IN-14
IN-15
2
B875-111 Swing Arm
Conversion Module Installation and Application Considerations
The B875-111 indicated differential inputs. When it was configured for single ended inputs, it was referred to as a B877-111.
SHIELD GROUNDING: For differential current analog inputs the B875-111 recommended grounding the field wiring shield at the B875-111 module. The
1492 conversion module accounts for this shield ground connection. The pre-wired cable used between the 1492-CM800-LA001 and the 1756-IF16 [1492ACABLE003UD] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected.
The B875-111 recommended placing jumpers from UNUSED to USED analog input channels. These jumpers MUST be removed or they will result in
improper operation.
The B75-111 analog input ranges were configured by DIP switches on the module. The appropriate range for the 1756-IF16 is configured by software.
This design assumes that all inputs on the B875-111 were connected to current transmitters. If there was a mix of current and voltage transmitters,
then modification of the pre-wired cable [1492-ACABLE003UD] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation
Manual for modification details.
CASE GROUND: If connected, remove this wire from the B875-111 terminal block, as it serves no purpose for the 1756-IF16.
Refer to your B875-111 and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features, and
[Reference Doc: 41170-766 (Version 03)]
configuration details.
10000021823 (Version 00)
(3)
V. 1492-CM800-LA001 Conversion Module Specifications
(Operating specifications are when installed in the Conversion System base / cover-plate assembly)
Specification
Dimensions
Approximate Shipping Weight
Storage Temperature
Operating Temperature
Operating Humidity
Shock
Non-operating
Operating
Operating Vibration
Maximum Operating Voltage
Max. Module Operating Current
Per Point:
Per Module:
Value
288.9 mm (height) x 139.7 mm (depth) x 44.5 mm (width)
11.37 in. (height) x 5.5 in. (depth) x 1.75 in. (width)
300g (0.66 lbs) (includes carton)
-40 to +85°C (-40 to +185°F)
0 to 55°C (32 to 131°F)
5 to 95% at 55°C (non-condensing)
50g
30g
2g @ 10-500Hz
60 Vdc
2 Amps (1492-CABLE connection pins are limited to 2A per pin)
12 Amps
Refer to the Wiring Diagram(s) for
NOTICE
current limits for a specific configuration.
Agency Certifications
Pollution Degree
Environmental Rating
UL Classified: Under UL File Number E113724
CSA
CE: compliant for all applicable directives
2
IP20
VI. Appendix A - 800 Housing to 1756 Chassis Conversion System Selection Process
1) Determine the number of 800 I/O modules actually used in the 800 I/O Housing to be converted to 1756 I/O.
2) Review the data in Column 5 from the below table, and select a 1756 I/O Chassis which meets your conversion
needs from Step 1. Ensure the information from the I/O Conversion module table is reviewed first since in some
cases, two 1756 modules are needed to replace one 800 I/O module.
3) Once the 1756 Chassis is selected, refer to Column 7 and select the Conversion Assembly.
1
2
3
4
5
6
7
1756
Chassis
Max.
Number
800
Housing
Max.
Number
1756 I/O Chassis
Modicon 800 I/O
Conversion Assembly
Width
Catalog Number of 1756 Chassis Width
Housing Cat Number of 800 Housing
Catalog Number
Slots for I/O
Dimension
Slots for I/O Dimension
1756-A4
3
10.25”
3
10.25”
AS-H810-xxx
1492-MUA4-MB3
A7 = 14.49”
A7 = 6, A10=9
17.5”
4
AS-H819-103
A10 = 19.02”
1756-A7
A7 = 14.49”
1492-MUA7-A10
or
A7 = 6, A10=9
6
17.5”
AS-H819-209
MB4679
1756-A10
A10 = 19.02”
A7 = 14.49”
A7 = 6, A10=9
7
17.5”
AS-H819-100
A10 = 19.02”
A10 = 19.02”
A10 = 9, A13=12
AS-H827-103
8
27.1”
A13 = 23.15”
A10 = 19.02”
1756-A10
1492-MUA10-A13or
A10 = 9, A13=12
27.1”
AS-H827-209
10
MB81011
A13
=
23.15”
1756-A13
A10 = 19.02”
A10 = 9, A13=12
11
27.1”
AS-B827-100
A13 = 23.15”
One chassis slot required for the ControlLogix processor or a remote I/O adapter type module.
The footprint and mounting dimensions of the 1492 Conversion Assembly (base plate and cover plate) match those of the
Modicon I/O Housing.
Width dimension includes the 1756 Chassis power supply.
Surplus Chassis width as compared to the 800 I/O Housing is divided equally when mounting it on the Conversion Assembly.
Mounting holes for the 1756 I/O Chassis are pre-drilled and pre-tapped into the Conversion Assembly cover plate.
Modicon is a Registered Trademark of Group Schneider
Article No. 4351310000
10000021823 (Version 00)
Printed in Germany
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