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Modbus and Modbus Plus Services
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Original instructions
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Modbus and Modbus Plus Services
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Original instructions
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Type
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Service Description
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Native CPU Ports
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NOM 1-2 Ports
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NOM 3-6 Ports1
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|---|---|---|---|---|---|---|---|
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Modbus
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Modbus Plus
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Modbus
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Modbus Plus
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Modbus
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Modbus Plus
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Modbus Services
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Default Modbus Port Parameters
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Yes
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-
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Yes
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-
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Yes
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-
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Configurable Modbus Port Parameters
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Yes
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-
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Yes
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-
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Yes(5)
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-
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Modbus to Modbus Plus Bridging
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Yes(1)
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-
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Yes(2)
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-
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Yes(2)
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-
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Local CPU Programming
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Yes(3)
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-
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Yes(3)
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-
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No
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-
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Remote CPU Programming over Modbus Plus
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Yes(3)
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-
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Yes(3)
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-
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Yes(1)
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-
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Modbus access to local CPU
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Yes
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-
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Yes
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-
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No
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-
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Modbus access to remote CPU over Modbus Plus
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Yes
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-
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Yes
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-
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Yes
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-
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Modbus Network Slave Support
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Yes
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-
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No
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-
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No
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-
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Modbus Master support with XMIT block
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Yes
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-
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No
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-
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No
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-
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Executive Firmware Loading Support
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Yes
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-
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No
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-
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No
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-
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Modbus Plus services
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MSTR read/write register messaging(4)
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-
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Yes
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-
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Yes
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-
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Yes
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MSTR read/write Global Data messaging
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-
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Yes
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-
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Yes
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-
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Yes
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MSTR get/clear local/remote statistics
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-
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Yes
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-
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Yes
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-
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Yes
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Config Extension Global Data Support
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-
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Yes
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-
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Yes
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-
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No
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Config Extension Peer Cop Support
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-
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Yes
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-
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Yes
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-
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No
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Distributed I/O Support
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-
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Yes
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-
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Yes
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-
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No
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CPU Programming
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-
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Yes(3)
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-
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Yes(3)
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-
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Yes(3)
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Executive Firmware Loading Support
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-
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Yes
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-
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No
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-
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No
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(1)The native CPU Modbus port can be disabled from bridge mode operation with the native Modbus Plus Port. (2)Modbus ports on NOMs are in bridge mode with their associated Modbus Plus port. (3)Only one programmer connection can be logged in at a time to any CPU, and only one program monitor can be attached at a time to any CPU. (4)Up to 4 MSTR read/write register instructions can be serviced per CPU scan per Modbus Plus port. (5)Modbus port parameters on NOMs 3-6 are defined by Modbus Port 3 when the comm parameter selector switch is in mem. |
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