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POMs
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POM = Pluggable Option Module
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BX-P-SER2-TERM: RS-232 port w/terminal connection
BX-P-SER4-TERM: RS-485 port w/terminal connection
BX-P-SER2-RJ12: RS-232 port w/RJ12 connection
BX-P-ECOMLT: Ethernet Communication (light) port
BX-P-USB-B: USB Type B port
◦ All are hot-swappable
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Hardware
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Non-isolated RS-232 serial port
ESD protection
Surge protection
Removable connector (BX-RTB03S)
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Do-more Protocol (programming, HMIs)
Modbus RTU (client/master & server/slave)
K-sequence (server/slave only)
Custom serial (e.g. ASCII)
Protocols
Max bit rate: 115K
DST50 ($InstalledPOM) = 3
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Hardware
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Non-isolated RS-232 serial port
ESD protection
Surge protection
RJ12 connector
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Do-more Protocol (programming, HMIs)
Modbus RTU (client/master & server/slave)
K-sequence (server/slave only)
Custom serial (e.g. ASCII)
Protocols
Max bit rate: 115K
DST50 ($InstalledPOM) = 5
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Hardware
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Protocols
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Non-isolated RS-485 serial port
ESD protection
Surge protection
Removable connector (BX-RTB03S)
Switch for termination resistor
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Do-more Protocol (programming, HMIs)
Modbus RTU (client/master & server/slave)
K-sequence (server/slave only)
Custom serial (e.g. ASCII)
Max bit rate: 115K
DST50 ($InstalledPOM) = 4
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Configuration
Can also setup
using SETUPSER
instruction
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Hot Swappable
◦ How does the PLC react?
PLC REACTION
 DST50 ($InstalledPOM)
indicates
which POM is
INSTRUCTION
REMOVE
RE-INSTALL
installed:
PROTOCOL
None: serves up
all memoryPOM
Unknown
 0=
None: serves up
 Server
1 = BX-P-USB-B
K-Seq
No reaction
DL-memory
 2RTU= BX-P-ECOMLT
Modbus
None: serves up
Server
M-memory
 3 = BX-P-SER2-TERM
- Instruction errors
Modbus RTU
MRX
 4 = BX-P-SER4-TERM
- ST11 ($HasWarmings)
Client
MWX
- ST143 ($DriverError)
Instruction resumes
 5 = BX-P-SER2-RJ12
- DST30 ($LastError1) = -2
operation
Program Control
- ERR = “Attempted
STREAMIN
(e.g. custom,
 255 = No
POM installed
operation not supported
STREAMOUT
Do-more
ASCII)
by device in…”
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Hardware
◦ USB Type B
◦ USB 2.0
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Protocols
◦ Do-more Protocol (programming)
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DST50 ($InstalledPOM) = 1
Nothing to configure
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Hardware
◦ Isolated Ethernet port
◦ Surge protection
◦ Transmission rate:
 10Mbps (orange LED)
 100Mpbs (green LED)
 Max 1Mpbs throughput
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Protocols
◦ Do-more protocol (server only)
 Do-more Designer programming
 HMI using Do-more protocol
 Accepts telegrams generated by RX/WX
instruction used in another Do-more’s
built-in Ethernet port
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DST50 ($InstalledPOM) = 2
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Configuration
The POM’s IP
Configuration is
normally set by
NetEdit3 or
SETUPIP instruction
Does not alter the IP
Configuration
stored in the POM
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Instructions
◦ ECOMLT POM
 SETUPIP “Setup TCP/IP Parameters”
 SETUPNOD “Setup Ethernet Node Parameters”
◦ All serial POMs (SER2, SER4)
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DEVCLEAR “Clear Device”
DEVREAD “Read Device Register”
DEVWRITE “Write Device Register”
OPENDEV “Open Device”
SETUPSER “Setup Serial Port”
STREAMIN “Stream in Data from Device”
STREAMOUT “Stream Out Data to Device”
MRX “Modbus Network Read”
MWX “Modbus Network Write”
◦ The USB POM can only be used for programming
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